A review on improving traffic flow using cooperative adaptive cruise control system

The ever-increasing demand of vehicular mobility in today´s life over loads the existing road transportation infrastructure and resources, for which a robust solution in the near future lies in effective utilization of currently available means of road transportation and infrastructure. For this purpose, development of Intelligent Transportation Systems (ITS) technologies that contribute to improved traffic flow stability, throughput, better utilization of infrastructure and safety is needed. In today´s traffic, to achieve the safe inter-vehicle distance, avoid congestion and improve safety, the limited human perception of traffic conditions and human reaction characteristics constrain should be analysed. In addition, erroneous human driving conditions may generate shockwaves in addition which causes traffic flow instabilities. In this paper to achieve regulated inter-vehicle distance and improved throughput, we consider Cooperative Adaptive Cruise Control (CACC) system, for vehicle string. Information of individual vehicle is exchange between vehicles through wireless communication in addition can give better performance. By introducing vehicle to vehicle (V2V) and vehicle to roadside unit (V2R) communications, the vehicle gets information not only from its preceding and following vehicle but also from the vehicles in front of the preceding one and following one.