Detection, Control and Warning System (DCWS) to mitigate Dilemma Zone (DZ)

To mitigate the Dilemma Zone (DZ) problem, Intelligent Automation, Inc. (IAI) team proposes an innovative vehicle specific Detection, Control and Warning System (DCWS). DCWS provides vehicle-specific dilemma zone protection based on travel time to the intersection as opposed to more conventional systems which protect a fixed area on the pavement. Apart from incorporating advanced signal control protocols, DCWS also warns the drivers in advance, who are going to be stuck in the DZ using an advanced warning system. The detection system includes prediction of vehicle travel time to the intersection and to the beginning and end of the DZ. Multi-point detection scheme using inductive loops is proposed so as to provide redundancy and to refine the estimates about the vehicle speeds. DCWS accommodates left/right turning vehicles; “major-major” rural intersections; and incorporates the use of warning before preemption and during coordination. To avoid the cabling cost, communications are performed wirelessly from loops to the processor using COTS equipment. The control algorithm will incorporate both predictions of when vehicles may be in the dilemma zone and signal control protocols (e.g., phase hold to extend green beyond max). Our proposed system in inexpensive, low risk and will provide additional safety for heavy vehicles.