Design and Evaluation of a Dynamic Dilemma Zone System for a High Speed Rural Intersection : Research Summary
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2012-08-01
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Alternative Title:Design & Evaluation of a Dynamic Dilemma Zone System for a High Speed Rural Intersection : Research Summary
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Abstract:Improving traffic safety is a priority transportation issue. A tremendous amount of
resources has been invested on improving safety and efficiency at signalized
intersections. Although programs such as driver education, red-light camera
deployment, and operational improvements to roadway geometry have all
contributed to a safer driving environment, significantly reducing traffic signalrelated
crashes remains a challenging task. For example, with the rapid urban
sprawl, many signals have been installed at high-speed rural intersections due to
their increasing traffic volumes. Most of those intersections have posted speed limits
over 50 mph, which can pose a hazardous situation for motorists when approaching
a signal during its yellow phase. Drivers in such situations could be caught in a socalled
dilemma zone: they can neither pass through the intersection before the light
turns red, nor can they slow down comfortably at the stop line. Insufficient
protection of motorists within the dilemma zone often leads to red-light running and
could result in severe accidents due to the high speeds.
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