Defining Dilemma Zone
In the pre-solicitation notice, the dilemma zone is “measured in traveling time/distance range to the intersection stop bar, within which about 90 percent of drivers will decide to brake whereas 10 percent of drivers will decide to accelerate at the time of phase change …”.
A question had been previously asked on this forum, pertaining to the definition of dilemma zones, and the response defined the zone for each car individually, based on their individual speeds; a car is in the dilemma zone when they will reach the intersection stop bar in about 2.5s - 5.5s.
The overall goal, as I understand it, is to identify when cars are in, or will be in, the dilemma zone at an intersection, but there is clearly a bit of ambiguity (even in the traffic) industry as to how the dilemma zone should be measured. Do we have some liberty to choose our definition of the dilemma zone in the project proposal? Or is there a rigid dilemma zone definition that Volve is interested in studying?
Wei Zhang commented
The provided definition of dilemma zone (2.5s to 5.5s travel time to intersection stop bar at time of start of Yellow Phase) factored in the variations in travel speed of different vehicles. Since this topic’s intent is to explore feasibility of edge computing to real time traffic control, offerors may base on the range of detected approaching speeds, define a practical physical distance range on each major approach. Note the interest is only in high speed (40 mph or above) vehicles caught in dilemma zone.