CONTINUOUS GREEN T
A Continuous Green T (CGT) is a three-sided intersection in the shape of a “T” where motorists traveling in one direction on the top side of the "T” (the main road) can travel straight through the intersection without ever having to stop.
Motorists traveling in the same direction who want to turn left are guided by a traffic signal.
Motorists traveling straight in the opposite direction on the top side of the “T” will have a traffic signal. They also have the option to merge right onto the lower side of the “T” (the side street).
Motorists traveling on the lower part of the “T” have two options: to turn left or turn right. Those turning left are guided by a traffic signal and those turning right, merge onto the main road.
This design prioritizes the highest need for traffic flow at a three-sided intersection, usually the direction that has the highest number of vehicles passing through.
CGTs are also known as:
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Green intersections
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High-T intersections
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Turbo-T
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Seagull intersections
When to use a CGT
A CGT is an effective design for a three-sided intersection with high traffic volumes on the main road and moderate-to-low traffic volumes on the connecting side street.
Benefits
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Safety —CGTs channel left-turning vehicles on the side street, which reduces the potential for angled crashes.
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Efficiency— Because one direction of travel on the major road is free-flow, more “green light” time can be provided to the other movements, reducing overall delays at the intersection. This also reduces the potential for bottlenecks.
How to use a CGT
All vehicle traffic should follow traffic signals and signs.
Motorists traveling on the main road/top side of the T in the continuous flow direction need to be in the center or right lanes if they want to travel straight and in the left lane if they wish to turn left.
Motorists traveling on the side street/lower T must make a decision about turning left or right and need to commit to those routes.
Pedestrians should note:
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Crosswalks are not provided across the main road. To cross the main road, pedestrians will need to find the next, nearest marked crosswalk.
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On the side street, pedestrians use marked crosswalks to safely cross.
CGTs may have designated bike lanes, but opposite of the lanes that are green-light free flow. Depending on their level of comfort, cyclists may navigate the intersection sharing the road or can use the pedestrian path.
CGTs in Kentucky
US 150/I-265 Intersection
Jefferson County
