VANET-Based CATS in the Absence of Communication Infrastructure

A coordinated adaptive traffic system (CATS) is being intended for controlling traffic flows in certain area by coordinating traffic signals among intersection's traffic controllers. Although intersections take only a relatively small part of the entire road system, the traffic control systems in intersections, is one of the most important problems to be solved with regard to the implementation of Intelligent Transportation Systems (ITS). This paper presents our feasiblity study of the using Vehicular ad-hoc network (VANET) for implementing CATS in the absence of communication infrastructure or in intermittent. For this we examined three different routing protocols for implementing such an infrastructure-less CATS. The results show that all the three examined protocols are feasible to be used to implement the VANET-based CATS. However, it shows that the Epidemic is superiors than the other protocols with regard to the delivery probability when the number of vehicles is only a few. When the number of vehicles is increasing then the Spray and Wait protocol give the best delivery probability of messages for delivering the coordination packets among intersections.