Comparison of dilemma zone length for car drivers between PTV Vissim and visual observation

Abstract

There is a zone known as the dilemma zone located on each arm of a signalized intersection, where in this zone, the vehicle at the start of the yellow light is hesitant to stop safely, before the stop line or continues past the intersection with the start of the red light. In the dilemma zone, there is a decision to go through the intersection at the risk of colliding with a car coming from the other arm, or a decision to stop suddenly which might result in a rear-end collision. The longer the dilemma zone, the higher the risk that the driver will pass through the intersection. Therefore, the purpose of this study is to compare the results between visual observations and PTV Vissim results regarding the yellow light dilemma zone for 3 seconds at the 4-arm intersection for car drivers. using the Gaziz method. The dilemma zone for passenger cars from visual observation compared to PTV Vissim simulation has a result of 55% longer with a distance of 6,15m to 28,65 m, where PTV Vissim shows a distance of 2,79 m to 11,25 m. This distance is based on the denser traffic situation during peak hour.