Emergency service vehicles need safety and fluent paths to save time. In this paper, a centralized traffic control mechanism is proposed for the evacuation of vehicles that drive toward the dedicated path of the emergency vehicles (EV), e.g. Ambulance, Fire Engines, Police Cars, etc, using the Dedicated Short Range Communications (DSRC) protocol. In our proposed mechanism, a centralized server is used to monitor and control all traffic information to support real time traffic information and services for emergency vehicles, and the centralized server also calculates the shortest path for emergency vehicles to pass by. If the approaching information of emergency vehicles is not announced in advance to other vehicles that will obstruct the approaching path of emergency vehicles, it will cause the traffic muddle on the road and increase the delayed time for emergency vehicles. Thus, we also propose a data dissemination scheme to transmit the warning messages to other vehicles that will obstruct the approaching road of emergency vehicles. In our experiment, we will exhibit the performance of our proposed system.

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In this study, a Telematics service discovery mechanism called Distributed telematics peer-to-peer for mobile users based on the peer-to-peer-like paradigm is proposed. When mobile users travel on the road, they may request for some services from service providers to meet their demands. Mobile users in vehicles are assumed to go through a lot of regions, in which each region is associated with a region server. Related information of all service providers in a region is stored in its region server, and each region server is in charge of service discovery requests sent from all vehicles that are currently in its region. Since mobile users in vehicles are moving and thus will pass by many regions on their ways to their destinations, a region server decision scheme should be devised in order to maintain correct connectivity between mobile users and their associated region servers. Then, a telematics service discovery mechanism can have awareness of its region server and correctly send requests to its associated region server. An application layer handoff mechanism is proposed to handoff data between region servers when the mobile user moves from one region to another region. Performance analyses of the proposed schemes are also depicted in the paper.

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