United States Department of Transportation
i
Field testing and implementation of dilemma zone protection and signal coordination at closely-spaced high-speed intersections : executive summary report.
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2005-05-01
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[PDF-41.37 KB]
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Edition:Executive summary report.
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Abstract:The area close to a signalized intersection,
called the dilemma zone, poses a high accident
potential for the driver in stopping safely during the
yellow interval or in proceeding through the
intersection before the beginning of red. Generally,
the location of the driver on the intersection
approach and the speed of the vehicle influence the
driver’s decision to stop or proceed when he sees
the green signal changing to yellow. The clearing
distance is the distance the vehicle travels between
the time the signal changes to yellow to the time the
signal changes to red. The stopping distance is the
distance traveled by the vehicle between the time
the signal changes to yellow to the time when the
vehicle actually comes to rest. If the stopping
distance is greater than the clearing distance, and
the vehicle is placed in between them, a dilemma
zone is formed. In this situation, neither the distance
to the intersection is adequate for stopping nor is the
signal interval adequate for clearing the
intersection. The driver is in a potentially hazardous
situation whereby, if he tries to cross the
intersection at the onset of red interval, he may end
up in an angle accident with the cross street traffic
or if he accelerates through yellow, he may end up
in a rear-end collision. The uncertain situation in a
dilemma zone can potentially lead to rear-end or
right angle collisions.
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