{"id":72392,"date":"2012-04-09T14:04:54","date_gmt":"2012-04-09T14:04:54","guid":{"rendered":"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/article\/exit-lane-left_o"},"modified":"2012-04-09T14:04:54","modified_gmt":"2012-04-09T14:04:54","slug":"exit-lane-left_o","status":"publish","type":"post","link":"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/projects\/infrastructure\/exit-lane-left_o\/","title":{"rendered":"Exit, lane left"},"content":{"rendered":"\n\n<div class=\"image-carousel\"\n\trole=\"region\"\n\taria-roledescription=\"carousel\"\n\taria-label=\"Image carousel\"\n\tdata-total-slides=\"3\"\n\t>\n\n\t<div class=\"image-carousel-top\">\n\t\t\n\t\t<div class=\"carousel-counter\">\n\t\t\t<span class=\"current-index\">1<\/span>\n\t\t\tof\t\t\t<span class=\"total-count\">3<\/span>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"image-carousel__hero-wrapper\">\n\t\t<button class=\"carousel-prev\"\n\t\t\t\taria-label=\"Previous slide\"\n\t\t\t\ttype=\"button\">\n\t\t\t<span class=\"icon\" aria-hidden=\"true\"><\/span>\n\t\t<\/button>\n\n\t\t<div class=\"carousel-main\" aria-live=\"polite\">\n\t\t\t\t\t\t\t<div class=\"carousel-slide active\"\n\t\t\t\t\tid=\"carousel-slide-0\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 1 of 3\"\n\t\t\t\t\taria-hidden=\"false\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Load the first image immediately at full size -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?w=300\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg 600w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=246,300 246w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=300,367 300w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=145,177 145w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=93,114 93w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=107,131 107w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 300px) 100vw, 300px\"\n\t\t\t\t\t\t\talt=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-caption=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"carousel-slide hidden\"\n\t\t\t\t\tid=\"carousel-slide-1\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 2 of 3\"\n\t\t\t\t\taria-hidden=\"true\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Lazy load other main images with data-src to be loaded only when needed -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?w=600\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg 600w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=300,90 300w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=315,95 315w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=202,61 202w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=232,70 232w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 600px) 100vw, 600px\"\n\t\t\t\t\t\t\talt=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\"\n\t\t\t\t\t\t\tclass=\"lazy-load-image\"\n\t\t\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-caption=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-credit=\"Click here to expand\"\n\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"carousel-slide hidden\"\n\t\t\t\t\tid=\"carousel-slide-2\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 3 of 3\"\n\t\t\t\t\taria-hidden=\"true\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Lazy load other main images with data-src to be loaded only when needed -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?w=200\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg 200w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?resize=178,114 178w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 200px) 100vw, 200px\"\n\t\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\t\tclass=\"lazy-load-image\"\n\t\t\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<button class=\"carousel-next\"\n\t\t\t\taria-label=\"Next slide\"\n\t\t\t\ttype=\"button\">\n\t\t\t<span class=\"icon\" aria-hidden=\"true\"><\/span>\n\t\t<\/button>\n\t<\/div>\n\n\t<div class=\"carousel-captions-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"carousel-caption active\"\n\t\t\t\t\tid=\"carousel-caption-0\">\n\t\t\t\t\t<div class=\"carousel-caption__inner\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-caption\" data-full-caption=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"caption-preview\">\n\t\t\t\t\t\t\t\t\tStep-by-step instructions for how to make a left turn in a displ&#8230;\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<button type=\"button\" class=\"read-more-toggle\"\n\t\t\t\t\t\t\t\t\t\t\taria-expanded=\"false\"\n\t\t\t\t\t\t\t\t\t\t\taria-controls=\"caption-full-0\">\n\t\t\t\t\t\t\t\t\t\tRead More\t\t\t\t\t\t\t\t\t<\/button>\n\t\t\t\t\t\t\t\t\t<span id=\"caption-full-0\" class=\"full-caption hidden\">\n\t\t\t\t\t\t\t\t\t\tStep-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"carousel-caption hidden\"\n\t\t\t\t\tid=\"carousel-caption-1\">\n\t\t\t\t\t<div class=\"carousel-caption__inner\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-credit\">Click here to expand<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-caption\" data-full-caption=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"caption-preview\">\n\t\t\t\t\t\t\t\t\tIn Snellville, Ga., an innovative solution was needed that could&#8230;\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<button type=\"button\" class=\"read-more-toggle\"\n\t\t\t\t\t\t\t\t\t\t\taria-expanded=\"false\"\n\t\t\t\t\t\t\t\t\t\t\taria-controls=\"caption-full-1\">\n\t\t\t\t\t\t\t\t\t\tRead More\t\t\t\t\t\t\t\t\t<\/button>\n\t\t\t\t\t\t\t\t\t<span id=\"caption-full-1\" class=\"full-caption hidden\">\n\t\t\t\t\t\t\t\t\t\tIn Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\n\t<div class=\"carousel-thumbnails-wrapper\" role=\"tablist\" aria-label=\"Thumbnail navigation\">\n\t\t<div class=\"carousel-thumbnails\">\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper active\"\n\t\t\t\t\t\tdata-index=\"0\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 1\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-1\"\n\t\t\t\t\t\taria-selected=\"true\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?w=150&#038;h=150&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper \"\n\t\t\t\t\t\tdata-index=\"1\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 2\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-2\"\n\t\t\t\t\t\taria-selected=\"false\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?w=150&#038;h=150&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper \"\n\t\t\t\t\t\tdata-index=\"2\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 3\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-3\"\n\t\t\t\t\t\taria-selected=\"false\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?w=150&#038;h=128&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t<\/div>\n\t<\/div>\n\n\t<\/div>\n\r \r<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\r <p class=\"wp-block-paragraph\"><strong>By Jay Bockisch, PE, PTOE, and Scott Shelton, PE<\/strong><\/p>\r <p class=\"wp-block-paragraph\">In better times, grade separation was the cure-all solution for intersections experiencing traffic volumes significantly over their design capacity. By adding an interchange, traffic engineers and roadway designers improved traffic flow, reduced driver delay, and improved safety. However, today&#8217;s tight budgets, limited rights of way, community opposition, and increased vehicle-miles traveled are compelling public agencies to find lower-cost and less obstructive alternatives to a grade-separation interchange.<\/p>\r <p class=\"wp-block-paragraph\">One alternative being implemented with increasing frequency is the displaced left-turn (DLT) design, also known as a continuous-flow intersection (CFI) or crossover displaced left-turn intersection (XDL). Instead of constructing tunnels, ramps, and\/ or bridges that are normally needed for a grade-separation interchange, a DLT incorporates traffic-signal timing, turn-lane placement, and access control to increase capacity at an intersection. The construction cost is approximately 80% to 90% less than a grade-separated interchange, while providing approximately 75% of the capacity improvements of grade separation.<\/p>\r <p class=\"wp-block-paragraph\">Before you decide if this design is the best fit for your intersection, you must first understand how it works and when it is deemed most successful.<\/p><p class=\"wp-block-paragraph\"><strong>What is a DLT?<\/strong>\r <\/p>\r <p class=\"wp-block-paragraph\">Although displaced left-turn designs look complicated on paper, they operate just like a traditional intersection. The differences begin with the traffic flow of left-turn and through-movements. At a typical intersection, the left-turn movement of vehicles proceeds prior to the through-movement occurring. A displaced left-turn design allows left turns to cross the opposing through-movement at a signalized intersection approximately 400 feet before the main intersection.<\/p>\r <p class=\"wp-block-paragraph\">After crossing the opposing through-traffic lane, left-turn vehicles travel on a roadway parallel to the opposing lanes, then execute the left turn simultaneously with the through-traffic at the main intersection. Traffic signals at the left-turn crossovers and the main intersection are operated in a coordinated mode so vehicles do not stop multiple times in the intersection area.<\/p>\r <p class=\"wp-block-paragraph\">Ideal for alleviating congested intersections with heavy left-turn traffic, DLT designs can help improve operational efficiency by limiting the number of traffic-signal phases, and can potentially reduce crashes by decreasing the number of conflict points at the intersection. They&#8217;re typically constructed within 18 months, with traffic maintained on the existing roadway as widening occurs to the outside. In contrast, a grade-separated interchange typically takes 24 to 36 months and costs up to $30 million to construct.<\/p>\r <p class=\"wp-block-paragraph\">The following case studies explain why Georgia DOT (GDOT) decided to implement this intersection design at three locations \u2014 and decided against it at another.<\/p><p class=\"wp-block-paragraph\"><strong>Satisfying constituent concerns<\/strong>\r <\/p>\r <p class=\"wp-block-paragraph\"><strong>Project:<\/strong> US 78\/SR 10 and SR 124 intersection, Snellville, Ga. <br><strong>Design cost:<\/strong> $2.5 million <br><strong>Estimated construction cost:<\/strong> $7 million \u2013 $10 million <br><\/p><!--nextpage-->\n\n<div class=\"image-carousel\"\n\trole=\"region\"\n\taria-roledescription=\"carousel\"\n\taria-label=\"Image carousel\"\n\tdata-total-slides=\"3\"\n\t>\n\n\t<div class=\"image-carousel-top\">\n\t\t\n\t\t<div class=\"carousel-counter\">\n\t\t\t<span class=\"current-index\">1<\/span>\n\t\t\tof\t\t\t<span class=\"total-count\">3<\/span>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"image-carousel__hero-wrapper\">\n\t\t<button class=\"carousel-prev\"\n\t\t\t\taria-label=\"Previous slide\"\n\t\t\t\ttype=\"button\">\n\t\t\t<span class=\"icon\" aria-hidden=\"true\"><\/span>\n\t\t<\/button>\n\n\t\t<div class=\"carousel-main\" aria-live=\"polite\">\n\t\t\t\t\t\t\t<div class=\"carousel-slide active\"\n\t\t\t\t\tid=\"carousel-slide-0\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 1 of 3\"\n\t\t\t\t\taria-hidden=\"false\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Load the first image immediately at full size -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?w=300\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg 600w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=246,300 246w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=300,367 300w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=145,177 145w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=93,114 93w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=107,131 107w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 300px) 100vw, 300px\"\n\t\t\t\t\t\t\talt=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-caption=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"carousel-slide hidden\"\n\t\t\t\t\tid=\"carousel-slide-1\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 2 of 3\"\n\t\t\t\t\taria-hidden=\"true\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Lazy load other main images with data-src to be loaded only when needed -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?w=600\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg 600w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=300,90 300w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=315,95 315w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=202,61 202w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=232,70 232w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 600px) 100vw, 600px\"\n\t\t\t\t\t\t\talt=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\"\n\t\t\t\t\t\t\tclass=\"lazy-load-image\"\n\t\t\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-caption=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-credit=\"Click here to expand\"\n\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"carousel-slide hidden\"\n\t\t\t\t\tid=\"carousel-slide-2\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 3 of 3\"\n\t\t\t\t\taria-hidden=\"true\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Lazy load other main images with data-src to be loaded only when needed -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?w=200\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg 200w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?resize=178,114 178w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 200px) 100vw, 200px\"\n\t\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\t\tclass=\"lazy-load-image\"\n\t\t\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<button class=\"carousel-next\"\n\t\t\t\taria-label=\"Next slide\"\n\t\t\t\ttype=\"button\">\n\t\t\t<span class=\"icon\" aria-hidden=\"true\"><\/span>\n\t\t<\/button>\n\t<\/div>\n\n\t<div class=\"carousel-captions-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"carousel-caption active\"\n\t\t\t\t\tid=\"carousel-caption-0\">\n\t\t\t\t\t<div class=\"carousel-caption__inner\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-caption\" data-full-caption=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"caption-preview\">\n\t\t\t\t\t\t\t\t\tStep-by-step instructions for how to make a left turn in a displ&#8230;\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<button type=\"button\" class=\"read-more-toggle\"\n\t\t\t\t\t\t\t\t\t\t\taria-expanded=\"false\"\n\t\t\t\t\t\t\t\t\t\t\taria-controls=\"caption-full-0\">\n\t\t\t\t\t\t\t\t\t\tRead More\t\t\t\t\t\t\t\t\t<\/button>\n\t\t\t\t\t\t\t\t\t<span id=\"caption-full-0\" class=\"full-caption hidden\">\n\t\t\t\t\t\t\t\t\t\tStep-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"carousel-caption hidden\"\n\t\t\t\t\tid=\"carousel-caption-1\">\n\t\t\t\t\t<div class=\"carousel-caption__inner\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-credit\">Click here to expand<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-caption\" data-full-caption=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"caption-preview\">\n\t\t\t\t\t\t\t\t\tIn Snellville, Ga., an innovative solution was needed that could&#8230;\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<button type=\"button\" class=\"read-more-toggle\"\n\t\t\t\t\t\t\t\t\t\t\taria-expanded=\"false\"\n\t\t\t\t\t\t\t\t\t\t\taria-controls=\"caption-full-1\">\n\t\t\t\t\t\t\t\t\t\tRead More\t\t\t\t\t\t\t\t\t<\/button>\n\t\t\t\t\t\t\t\t\t<span id=\"caption-full-1\" class=\"full-caption hidden\">\n\t\t\t\t\t\t\t\t\t\tIn Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\n\t<div class=\"carousel-thumbnails-wrapper\" role=\"tablist\" aria-label=\"Thumbnail navigation\">\n\t\t<div class=\"carousel-thumbnails\">\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper active\"\n\t\t\t\t\t\tdata-index=\"0\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 1\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-1\"\n\t\t\t\t\t\taria-selected=\"true\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?w=150&#038;h=150&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper \"\n\t\t\t\t\t\tdata-index=\"1\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 2\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-2\"\n\t\t\t\t\t\taria-selected=\"false\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?w=150&#038;h=150&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper \"\n\t\t\t\t\t\tdata-index=\"2\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 3\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-3\"\n\t\t\t\t\t\taria-selected=\"false\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?w=150&#038;h=128&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t<\/div>\n\t<\/div>\n\n\t<\/div>\n<p class=\"wp-block-paragraph\"><strong>Estimated construction time line:<\/strong> March 2014 \u2013 October 2015<\/p>\r <p class=\"wp-block-paragraph\">A well-known traffic problem to local commuters, the intersection&#8217;s heavy left-turn movements in the morning and afternoon rush hours slow traffic to a crawl. Design and consulting firm Gresham, Smith and Partners performed an intersection capacity analysis that graded the intersection&#8217;s level of service with an E and gave operational efficiency an F (E\/F; intersections are given a letter grade to describe service level\/operational efficiency with an A representing very good and F as very bad).<\/p>\r <p class=\"wp-block-paragraph\">The morning rush-hour intersection delay is 60 seconds and the afternoon delay is 126 seconds. The firm projected that in 20 years the level of service will drop to F\/F with an average delay of more than three minutes.<\/p>\r <p class=\"wp-block-paragraph\">GDOT considered many options to improve the intersection, from building a bypass to divert traffic around Snellville to building a multilevel traffic circle estimated to cost $100 million. All were met with heavy opposition from the public, due to impacts to property owners.<\/p>\r <p class=\"wp-block-paragraph\">Another solution was to grade separate the intersection to provide more efficient through capacity and to separate the left-turn movement from the through-movement. This solution wasn&#8217;t considered viable for several reasons. First, the intersection is in the heart of downtown and grade separation would sever the city in two and might potentially create a high-speed corridor through the city. Second, several historic houses exist along the roads leading to the intersection, and the project would demolish these resources and jeopardize any federal funding. Third, the intersection is on a curve so US 78\/SR 10 would have to be straightened to accommodate bridge construction. The overall cost was estimated to be approximately $80 million.<\/p>\r <p class=\"wp-block-paragraph\">GDOT needed a different solution that could both improve traffic flow and balance impacts to the city and its property owners. Since the heaviest left-turn movement is from US 78\/SR 10 to SR 124, a two-legged displaced left-turn lane was proposed on US 78\/SR 10, with a free-flow right-turn lane for SR 124 to US 78\/SR 10. The estimated construction cost is approximately one-tenth that of a grade separation.<\/p>\r <p class=\"wp-block-paragraph\">The two-legged displaced left turn is being constructed by widening the northern side of the intersection, thereby protecting the historic resources on the south side and reducing the overall construction cost by $3 million to $5 million. This will allow the intersection to operate at a C\/D level of service, with a 33-second delay in the morning and 38-second delay in the afternoon.<\/p>\r <p class=\"wp-block-paragraph\">An underutilized bypass around the intersection to the south will be used as a detour during construction, and will serve in the future as a bypass for through-traffic on US 78\/SR 10. This will further improve the level of service.<\/p>\r<\/div> \r<p class=\"wp-block-paragraph\">\r \r<\/p>\r\r \r\r <strong>Similar results, cheaper solution<\/strong>\r <p class=\"wp-block-paragraph\"><strong>Project:<\/strong> SR 400 and SR 53 intersection, Dawsonville, Ga. <br><strong>Design cost:<\/strong> $2.4 million <br><strong>Estimated construction cost:<\/strong> $10 million \u2013 $12 million <br><strong>Estimated construction time line:<\/strong> February 2015 \u2013 August 2016<\/p>\r <p class=\"wp-block-paragraph\">Grade separation would be the best \u2014 but more costly \u2014 solution for this intersection. An overpass would allow through-traffic on SR 400 to cross SR 53 without stopping.<\/p>\r <p class=\"wp-block-paragraph\">But limited funding led GDOT to choose a displaced left-turn design that promises similar operational improvement at 10% to 20% the cost. A two-legged displaced left turn was proposed for SR 400 with free-flow right-turn lanes on SR 53.<\/p>\r <p class=\"wp-block-paragraph\">Fortunately, the intersection has several good design characteristics for conversion to a DLT. The intersection angle is 90 degrees, which provides adequate sight distance for drivers and allows roadway designers to widen intersection legs without having to super-elevate for roadway curvature. Plus, the existing right-of-way width and grassy median along SR 400 provides ample space to add dual left-turn lanes. The intersection&#8217;s heavy left-turn movements from SR 400 onto SR 53 also make it a good candidate.<\/p><p class=\"wp-block-paragraph\"><strong>Plan B still works<\/strong>\r <\/p>\r <p class=\"wp-block-paragraph\"><strong>Project:<\/strong> Jimmy Carter Boulevard\/SR 140 and Buford Highway SR 13 intersection in Norcross <br><strong>Design cost:<\/strong> $800,000 (paid for by Gwinnett Village Community Improvement District) <br><strong>Estimated construction cost:<\/strong> $5 million \u2013 $7 million <br><strong>Estimated construction time line:<\/strong> January 2014 \u2013 June 2015<\/p>\r <p class=\"wp-block-paragraph\">The Gwinnett Village Community Improvement District initially considered two grade-separated interchange concepts: a compact interchange and a jug handle\/quadrant road. The costs for these options ranged from $15 million to $50 million, so the community improvement district also evaluated, and ultimately approved, a displaced left-turn lane proposal as a low-cost alternative.<\/p>\r <p class=\"wp-block-paragraph\">The proposal was not without its hiccups. The intersection warranted a two-legged continuous-flow intersection on Jimmy Carter Boulevard, but several constraints exist. First, the grade prior to the intersection is more than 10%, which would slow vehicles traversing through the DLT, and make it difficult for approaching drivers to see the displaced left-turn traffic signals. This scenario would require longer signal times that would reduce overall efficiency.<\/p>\r <p class=\"wp-block-paragraph\">Second, a railroad overpass bridge is in close proximity to the intersection, so the crossover movement for the left-turn lanes couldn&#8217;t be placed far enough away from the main intersection to ensure proper operation. Third, South Peachtree Street is the main entrance into downtown Norcross. The design would change access to the street to right in, right out, thus limiting left-turn access into the downtown area from the boulevard.<\/p>\r <p class=\"wp-block-paragraph\">Buford Highway, on the other hand, had few if any constraints. Sufficient sight distance was available and no major impacts would prevent the construction of the left-turn crossover lanes. Therefore, even though the traffic volumes support the displaced left-turn lanes be built on Jimmy Carter Boulevard, the district decided to construct them on Buford Highway instead.<\/p>\r <p class=\"wp-block-paragraph\">The solution still works because it improves traffic-signal efficiency and significantly reduces the delay at the intersection.<\/p><p class=\"wp-block-paragraph\"><strong>Conventional methods win<\/strong>\r <\/p>\r <p class=\"wp-block-paragraph\"><strong>Project:<\/strong> Whitfield County Safety Project <br><strong>Design cost:<\/strong> $300,000 <br><strong>Estimated construction cost:<\/strong> $2 million \u2013 $3 million <br><\/p><!--nextpage-->\n\n<div class=\"image-carousel\"\n\trole=\"region\"\n\taria-roledescription=\"carousel\"\n\taria-label=\"Image carousel\"\n\tdata-total-slides=\"3\"\n\t>\n\n\t<div class=\"image-carousel-top\">\n\t\t\n\t\t<div class=\"carousel-counter\">\n\t\t\t<span class=\"current-index\">1<\/span>\n\t\t\tof\t\t\t<span class=\"total-count\">3<\/span>\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"image-carousel__hero-wrapper\">\n\t\t<button class=\"carousel-prev\"\n\t\t\t\taria-label=\"Previous slide\"\n\t\t\t\ttype=\"button\">\n\t\t\t<span class=\"icon\" aria-hidden=\"true\"><\/span>\n\t\t<\/button>\n\n\t\t<div class=\"carousel-main\" aria-live=\"polite\">\n\t\t\t\t\t\t\t<div class=\"carousel-slide active\"\n\t\t\t\t\tid=\"carousel-slide-0\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 1 of 3\"\n\t\t\t\t\taria-hidden=\"false\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Load the first image immediately at full size -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?w=300\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg 600w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=246,300 246w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=300,367 300w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=145,177 145w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=93,114 93w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?resize=107,131 107w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 300px) 100vw, 300px\"\n\t\t\t\t\t\t\talt=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-caption=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"carousel-slide hidden\"\n\t\t\t\t\tid=\"carousel-slide-1\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 2 of 3\"\n\t\t\t\t\taria-hidden=\"true\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Lazy load other main images with data-src to be loaded only when needed -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?w=600\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg 600w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=300,90 300w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=315,95 315w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=202,61 202w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?resize=232,70 232w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 600px) 100vw, 600px\"\n\t\t\t\t\t\t\talt=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\"\n\t\t\t\t\t\t\tclass=\"lazy-load-image\"\n\t\t\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-caption=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tdata-credit=\"Click here to expand\"\n\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"carousel-slide hidden\"\n\t\t\t\t\tid=\"carousel-slide-2\"\n\t\t\t\t\trole=\"tabpanel\"\n\t\t\t\t\taria-roledescription=\"slide\"\n\t\t\t\t\t\t\t\t\t\taria-label=\"Slide 3 of 3\"\n\t\t\t\t\taria-hidden=\"true\">\n\n\t\t\t\t\t\t\t\t\t\t\t<!-- Lazy load other main images with data-src to be loaded only when needed -->\n\t\t\t\t\t\t<img\n\t\t\t\t\t\t\tsrc=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?w=200\"\n\t\t\t\t\t\t\tsrcset=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg 200w, https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?resize=178,114 178w\"\n\t\t\t\t\t\t\tsizes=\"(max-width: 200px) 100vw, 200px\"\n\t\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\t\tclass=\"lazy-load-image\"\n\t\t\t\t\t\t\tloading=\"lazy\"\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<button class=\"carousel-next\"\n\t\t\t\taria-label=\"Next slide\"\n\t\t\t\ttype=\"button\">\n\t\t\t<span class=\"icon\" aria-hidden=\"true\"><\/span>\n\t\t<\/button>\n\t<\/div>\n\n\t<div class=\"carousel-captions-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"carousel-caption active\"\n\t\t\t\t\tid=\"carousel-caption-0\">\n\t\t\t\t\t<div class=\"carousel-caption__inner\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-caption\" data-full-caption=\"Step-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"caption-preview\">\n\t\t\t\t\t\t\t\t\tStep-by-step instructions for how to make a left turn in a displ&#8230;\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<button type=\"button\" class=\"read-more-toggle\"\n\t\t\t\t\t\t\t\t\t\t\taria-expanded=\"false\"\n\t\t\t\t\t\t\t\t\t\t\taria-controls=\"caption-full-0\">\n\t\t\t\t\t\t\t\t\t\tRead More\t\t\t\t\t\t\t\t\t<\/button>\n\t\t\t\t\t\t\t\t\t<span id=\"caption-full-0\" class=\"full-caption hidden\">\n\t\t\t\t\t\t\t\t\t\tStep-by-step instructions for how to make a left turn in a displaced left-turn intersection. Images: Gresham, Smith and Partners\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"carousel-caption hidden\"\n\t\t\t\t\tid=\"carousel-caption-1\">\n\t\t\t\t\t<div class=\"carousel-caption__inner\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-credit\">Click here to expand<\/p>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<p class=\"image-caption\" data-full-caption=\"In Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"caption-preview\">\n\t\t\t\t\t\t\t\t\tIn Snellville, Ga., an innovative solution was needed that could&#8230;\n\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<button type=\"button\" class=\"read-more-toggle\"\n\t\t\t\t\t\t\t\t\t\t\taria-expanded=\"false\"\n\t\t\t\t\t\t\t\t\t\t\taria-controls=\"caption-full-1\">\n\t\t\t\t\t\t\t\t\t\tRead More\t\t\t\t\t\t\t\t\t<\/button>\n\t\t\t\t\t\t\t\t\t<span id=\"caption-full-1\" class=\"full-caption hidden\">\n\t\t\t\t\t\t\t\t\t\tIn Snellville, Ga., an innovative solution was needed that could both improve traffic flow and balance impacts to the city and property owners. Since the heaviest left-turn movement was from US 78\/SR 10 to SR 124, a two-legged displaced left turn was proposed on US78\/SR 10, and a free-flow right-turn lane was proposed for SR 124 to US78\/SR 10.\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/p>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\n\t<div class=\"carousel-thumbnails-wrapper\" role=\"tablist\" aria-label=\"Thumbnail navigation\">\n\t\t<div class=\"carousel-thumbnails\">\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper active\"\n\t\t\t\t\t\tdata-index=\"0\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 1\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-1\"\n\t\t\t\t\t\taria-selected=\"true\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d0-2etmp-tcm111-1358079.jpg?w=150&#038;h=150&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper \"\n\t\t\t\t\t\tdata-index=\"1\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 2\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-2\"\n\t\t\t\t\t\taria-selected=\"false\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d1-2etmp-tcm111-1358080.jpg?w=150&#038;h=150&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t\t\t<button class=\"thumbnail-wrapper \"\n\t\t\t\t\t\tdata-index=\"2\"\n\t\t\t\t\t\t\t\t\t\t\taria-label=\"Go to slide 3\"\n\t\t\t\t\t\taria-controls=\"carousel-slide-3\"\n\t\t\t\t\t\taria-selected=\"false\"\n\t\t\t\t\t\ttype=\"button\"\n\t\t\t\t\t\trole=\"tab\"\n\t\t\t\t>\n\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/wp-content\/uploads\/sites\/10\/2025\/06\/tmp2d2-2etmp-tcm111-1358081.jpg?w=150&#038;h=128&#038;crop=1\"\n\t\t\t\t\t\taria-hidden=\"true\"\n\t\t\t\t\t\talt=\"\"\n\t\t\t\t\t\tclass=\"thumbnail\">\n\t\t\t\t<\/button>\n\t\t\t\t\t<\/div>\n\t<\/div>\n\n\t<\/div>\n<ul class=\"wp-block-list\"><li><strong>Estimated construction time line:<\/strong> May 2012 \u2013 May 2013<p class=\"wp-block-paragraph\"><\/p>\r <p class=\"wp-block-paragraph\">GDOT decided not to use a displaced left-turn lane because the intersection isn&#8217;t a good candidate for the design. Problematic features included steep approach grades to the intersection that would hinder drivers&#8217; ability to see the traffic signals. Also, a major structure located close to the intersection would have to be widened to add a displaced left-turn lane on that leg, increasing costs by up to $1 million.<\/p>\r <p class=\"wp-block-paragraph\">Instead, the transportation department is installing a protected left-turn phase to the traffic signal and constructing dual left-turn lanes to allow more vehicles through the intersection.<\/p>\r <p class=\"wp-block-paragraph\">As these case studies reveal, a displaced left-turn lane is a great tool for relieving traffic congestion at intersections with heavy left-turn traffic. But it should be evaluated on a case-by-case basis against other alternatives.<\/p>\r <p class=\"wp-block-paragraph\"><em>\u2014 Bockisch <a href=\"mailto:(jay_bockisch@gspnet.com\" target=\"_blank\">(jay_bockisch@gspnet.com)<\/a> and Shelton <a href=\"mailto:(scott_shelton@gspnet.com\" target=\"_blank\">(scott_shelton@gspnet.com)<\/a> are senior associates with Gresham, Smith and Partners.<\/em><\/p><p class=\"wp-block-paragraph\"><strong>WEB EXTRA<\/strong>\r <\/p>\r <p class=\"wp-block-paragraph\">For videos on how displaced left-turn intersections in Gwinnett County and Snellville, Ga., work, <a href=\"\/bridges\/april-2012.aspx?dfpzone=roadways.design\">click here<\/a>.<\/p>\r<\/li><\/ul> \r<p class=\"wp-block-paragraph\">\r \r<\/p>\r\r \r\r <strong>PUTTING THE PIECES TOGETHER<\/strong>\r <p class=\"wp-block-paragraph\">When considering whether a displaced left-turn (DLT) intersection is the best solution, consider the following questions:<\/p><p class=\"wp-block-paragraph\">\r \r Is there a need at this intersection that cannot be addressed with traditional operational improvements? DLTs often are viable alternatives for traffic volumes with heavy left-turning movements. However, they are generally not practical for major urban downtown areas with constrained right-of-way and railroad crossings in close proximity to the intersection.<\/p><li>\r Does the geometry of the intersection allow for a displaced left turn? Vertical grades should be flat to moderate and horizontal alignments 80 to 90 degrees. The road should also have sufficient storage \u2014 about 400 feet \u2014 to relocate the left-turn lanes away from the intersection. Also remember that even though the best layout might not be possible, displaced left turns could still improve traffic flow at the intersection (see \u201cPlan B still works\u201d).<\/li><li>\r Is funding available to implement a grade-separated interchange? Or do right-of-way constraints prevent a major grade separation? Compare the benefit-cost ratio of the DLT to other alternatives. The design often tends to have higher benefit-cost ratios due to significantly lower construction cost.<\/li><li>\r Is the design supported by the public agencies, and will the community support it? To garner agency and public support, public outreach may be needed to educate officials and constituents on the benefits of the design. A \u201cchampion\u201d may need to promote the project within the public agency.<\/li><li>\r Are there other access locations? Would future development encourage new access locations? The ideal situation is if no access is needed at the four quadrants immediately adjacent to the intersection. However, access can be provided either via U-turn openings in the median for the displaced left turn or connector streets. If all four quadrants are fully built-out with no interconnectivity, then a DLT might not be the best solution.<\/li><li>\r Are there major pedestrian movements or transit stops at the intersection? A DLT uses multiple stages to cross pedestrians through the intersection via refuge islands, and actually reduces the overall pedestrian crossing time when compared to a traditional intersection. Therefore, it&#8217;s a good option for pedestrian crossings. Preferably, transit stops should be located upstream or downstream from the intersection. High-transit traffic can be accommodated via bus pullovers.<\/li>\r \r \r","protected":false},"excerpt":{"rendered":"<p>By Jay Bockisch, PE, PTOE, and Scott Shelton, PE In better times, grade separation was the cure-all solution for intersections experiencing traffic volumes significantly over their design capacity. By adding an interchange, traffic engineers and roadway designers improved traffic flow, reduced driver delay, and improved safety. However, today&#8217;s tight budgets, limited rights of way, community [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"scheduledNewsletterDates":[],"_scheduled_newsletter_id":0,"footnotes":"","jetpack_post_was_ever_published":false,"zonda_content_type_url_append":"_o","zonda_dfp_zone":"","zonda_exclude_recommended_contents":false,"zonda_exclude_most_popular":false,"zonda_exclude_tagged_results":false,"zonda_eyebrow":"Traffic Control","zonda_last_newsletter_date":"2099-12-31T23:59:59.999-05:00","zonda_original_url":"","zonda_pdf_version":0,"zonda_print_headline":"Exit, lane left","zonda_promo_abstract":"How to decide if a displaced left-turn design is a good fit for your intersection.","zonda_promo_headline":"","zonda_promo_image":0,"zonda_subheadline":"How to decide if a displaced left-turn design is a good fit for your intersection."},"tags":[],"news_item_type":[780],"section_10":[83124],"subject":[29039,581,399,1345,30151,983,1535,674],"organization":[],"award":[],"person":[1622],"product_type_10":[],"content-group":[],"event":[],"location":[202],"state":[],"brand":[21460],"jlc-category":[],"year_tax":[],"sponsor":[],"coauthors":[89853],"class_list":["post-72392","post","type-post","status-publish","format-standard","hentry","news_item_type-feature","section_10-infrastructure","subject-311-call-centers","subject-bridges-and-culverts","subject-infrastructure-projects","subject-right-of-way","subject-roadways","subject-traffic-control","subject-transportation-projects","subject-transportation-safety","person-jimmy-carter","location-atlanta-sandy-springs-marietta-ga","brand-public-works"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Exit, lane left<\/title>\n<meta name=\"description\" content=\"How to decide if a displaced left-turn design is a good fit for your intersection.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/projects\/infrastructure\/exit-lane-left_o\" \/>\n<link rel=\"next\" href=\"https:\/\/zonda-develop.go-vip.net\/concrete-construction\/projects\/infrastructure\/exit-lane-left_o\/2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Exit, lane left\" \/>\n<meta property=\"og:description\" content=\"How to decide if a displaced left-turn design is a good fit for your intersection.\" \/>\n<meta property=\"og:url\" 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