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:: A Success research accomplishment for the Applied Technology and Traffic Analysis Program (ATTAP) led by Professor Chang
Posting Date : 2012-11-01 17:51:37 , Visit : 14,307

The high speed, isolated rural intersection of US 40 and Red Toad Road, in Cecil County, MD had experienced 89 crashes between 2000-2010, with 45% of those crashes were potentially related to dilemma zones (a term used to describe the situation when a motorist can neither stop nor clear intersection at during the yellow interval). To address this issue, the Applied Technology and Traffic Analysis Program (ATTAP) in collaboration with the Maryland State Highway Administration (MD SHA) designed and installed a state-of the-art dynamic dilemma zone protection system at this intersection.
The system incorporates a microwave sensor that continuously tracks vehicles as they approach the intersection. This tracking feature allows the system to estimate if a vehicle can clear the intersection before the side street traffic is released. For those vehicles that need extra time to clear the intersection, an all-red extension interval is call, thus holding the side street traffic for up to 2.5 additional seconds to allow approaching vehicle(s) to safely cross the intersection. Since the system was installed and activated in late 2011, no crashes related to dilemma zones have been reported. The success of this system has peaked the interest of Maryland SHA officials who has asked the research team to design and deploy similar dilemma zone protection systems for more high speed rural intersections. The system is in the process for applying the US patent.


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