| dc.description.abstract | In every year, there are so many people die or hunt because of car accident. In order to make more comfortable, safer driving environment, therefore, all of automotive industry, government and organization are trying to find the solution to improve it. Due to the technique of wireless made a great progress, the framework of Vehicle Ad-hoc Network (VANETs) and Intelligent Transport Systems (ITS) are developed.
VANETs is a wireless technique which can exchange the data between vehicles without base station, or it can communicate with outside via base station. This can develop so many applications, such as Cooperative Intersection Collision Avoidance Systems (CICAS). Many researches provide some solution to reduce the number of accident, but they do not consider the situation of traffic signal breakdown and braking numbers.
This thesis proposes using of Signal Breakdown Message; this message provides the early warning ability and prevents the collision of intersection when traffic signal is breakdown. In addition to send warning message, it can maintain limited traffic to prevent more accident.
Finally, the thesis uses NCTUns 6.0 simulator to simulate, and comparing itself with traffic signal is breakdown. By the result, it improves 56.23% for intersection collisions, it improves 16.35% for emergency brake, it improves 5.30% for vehicle brake, it improves 72.28% for average vehicle delay time by traffic signal breakdown, and it improves 22.59% for average vehicle end-to-end delay time. It proves that it can reduce the collisions.
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