Synchronization Model of Traffic Light at Intersection with Train Track

Abstract

The most common role of traffic lights are as signal systems to control transportation at urban networks and traffic management. Urban traffic lights in most of countries used fixed time. The traffic light systems installed on urban traffic network at an intersection consist of four arms. There is a railroad crossing on the south arm. At this time introduced the new model design of interruptive traffic lights. The new model is the syncronization between traffic lights and train doorstop. It is modeled by Petri Net. The method to analyze the model using: 1. Invariant Method. 2. Occurrence Graph Method, and 3. Simulation. The queue of vehicles happens at extension schedule less than queue at regular schedule if the closure of the railway doorstop ended when the lights north-south traffic lights red. Probability of north–south traffic light flashed red in a cycle is 0.62. The statistical expectation value of the number of queues of vehicles on extension schedule decreased. On south arm down 2.71 PCU and on northern arm down 2.34 PCU. It means that extension schedule gives positive results. The extra green 16 seconds will improve the performance of traffic light.