Vehicular Ad hoc networks (VANETs) become a most trending topic nowadays hence it is attracted by the industrial environment and the academic sector. The vehicles which are present in the network communicate with the adjacent vehicles and the roadside units through the routing model using the standard of IEEE 802.11p. To make the routing more flexible the vehicles undergo certain challenges hence the mobility of the vehicles is so high and that result in the failure in communication link. Additionally due to irregular spectrum allocation the emergency data transmission is disturbed and that greatly reduces the communication quality. In order to overcome these drawbacks in this article effective spectrum allocation with priority function and multipoint relay based efficient routing model (ESPMRR) is developed in the vehicular communication. The core modules are network construction, channel model creation, priority-based data transmission and multipoint relay-based routing. Through this process the earlier drawbacks are rectified and that leads to attend an effective communication among the vehicles. The implementation of ESPMRR is constructed in the software NS3 and the matrix like energy efficiency, routing overhead, packet delivery ratio, network throughput and average delay are measured. The simulation results prove that ESPMRR attends better results when compared with the previous works.