Effective relative position detection for multicasting of alert messages

This information can be shared with other nodes in the network and is central requirement for VANET application like navigation, intelligent transportation, collision avoidance and location based services. In case of emergency all the vehicles in the network are not affected so broadcasting of alert packet is not feasible rather multicasting of alert packet should be done, but defining the list of node to be considered for multicasting is a challenging task as every vehicle cannot hold the location information of all the vehicles in the network.