Approach to Priority-Based Controlling Traffic Lights

One of causes of repeated traffic congestion at crossroads in Hochiminh City is the unreasonableness of the current system controlling traffic lights that switches lights at fixedly programmed time points. In several cases, vehicles are compelled to stop at stop line while nothing travels on front crossroad, and emergency vehicles can not overpass crowd of vehicles stopping in front of traffic lights. Moreover, the too slow movement of vehicles within crossroad due to conflict of directions is also a cause of congestion and jam. This study proposes an approach, termed the approach to priority-based controlling traffic lights, to serving as a module of traffic light system. The approach eliminates the conflict of vehicles moving within crossroad to decrease the time passing crossroad. Traffic lights are switched according to the priority of directions to reduce the thickness of vehicles in front of traffic lights of directions. As a result, the approach prevents congestion within crossroad and in front of traffic lights at flows entering crossroad.