Development of substitution system for vehicular collision avoidance support system (VCASS) by personal mobile terminal - S-VCASS -

In recent years, many researches and developments on ITS have been carried out to solve many problems in road traffic. IVC (Inter-Vehicular Communications) is the key technology to realize the next generation ITS. Vehicles install telecommunication equipments, and exchange safety information directly with each other. The authors have developed Vehicular Collision Avoidance Support System (VCASS) based on IVC in order to prevent a vehicular accident beforehand. The system grasps the relative locations of vehicles by exchanging the GPS information in each vehicle. The system warns drivers if it detects some danger of vehicular collisions. VCASS can drastically reduce the potential accidents of vehicular collisions. Advanced safety technologies such as VCASS will popularize in future. However, it takes a long time to widespread VCASS systems for almost all vehicles in the world. So, it will happen that vehicles with VCASS and without VCASS coexist in traffic roads of the near future. In this paper, we develop a substitution system for VCASS (S-VCASS) by a specific personal mobile terminal in order to improve the effectiveness of VCASS in the environment of mixed VCASS and non-VCASS vehicles. We propose three kind of pedestrian state judgment algorithms which go into personal mobile terminals for inter-vehicle communication. We evaluate performances of three proposed algorithms with real vehicles. As a result, we show that the proposed algorithm can recognize vehicles without VCASS by adding a function of the proposed algorithm to mobile terminals.