Traffic Flow Control System Design Based On The VANET

With the increasing of the vehicle and traffic pressure, obviously all countries in the world is faced with the problem of traffic congestion. Due to the effects on the economic and environment, traffic jams is beyond question. Therefore, The current study proposes a novel real-time traffic controlling system which takes advantage of Vehicle Ad-hoc Network (VANET) and vehicle platoon system. The proposed system comprises two main phases.The first phase, based on VANET detection of traffic flow and traffic signal control system has put forward. The phase includes estimation of vehicles’density in road segment leading to intersection by utilizing the combination of Vehicle-to-Vehicle (V2V) communication and Vehicle-to-Infrastructure (V2I) communication for transfer-ring the acquired information to the Traffic Controller. Then it contains assessment and analysis of obtained data from the above to create various adaptive traffic signal cycles to control the traffic congestion. The most distinct capability of this approach which makes it more effective in comparison with fixed timing cycle control, is controlling the traffic flow of vehicles in adjacent intersections by considering the future destination of vehicles and anticipation in traffic signal timing of contiguous intersections. By the algorithm simulation experiment, this part of the simulation results show that compared with fixed cycle control, puts forward the method reduces the vehicles in the intersections of delay time.A new nonlinear longitudinal spacing control of vehicles in a platoon is proposed in the second phase, which takes into account both vehicle characteristics and road conditions. By the algorithm simulation experiment, it the string stability of a string of vehicles, traffic flow stability and in comparison with the common constant time-gap spacing control increases the capacity of traffic flow.