Objectives: To maintain Quality of Service (QOS) for data dissemination, prevent packet loss and high reachability. Methods: To achieve this, CPDD: Clustering and Probabilistic based Data Dissemination in Vehicular Adhoc Networks is proposed. The messages are disseminated between the clusters. The Performance metrics like throughput, jitter, Normalized Routing Load, Routing Overhead and packet loss ratio are analysed using NS2 and the results are compared for the varying number of nodes. Findings: The proposed approach has a low packet drop ratio and end-to-end delay compared to SECADD, SEAD and S1PD. The efficiency of the traffic system and the quality of driving are both improved by data dissemination through VANETs by using CPDD. The goal of an effective clustering method is to reduce the number of clusters while maintaining high communication over the vehicular network. Novelty: Establishing effective communication between two fastmoving vehicles is a major challenge in VANET. The challenge in designing a robust and reliable message dissemination technique is required for VANET safety applications. The results of the proposed model CPDD is compared for different numbers of nodes. The proposed work improves the QOS metrics with the Normalized Routing Load of 1.009%, Routing Overhead of 1.03 bits/sec, throughput of 205.5 bits/sec, end-to-end delay of 0.435 seconds and packet loss ratio of 20.02% for 50 nodes.

Vehicular Adhoc Network (VANET) is a distinct type of Mobile Adhoc Networks (MANET) that makes use of moving vehicles as nodes to create a mobile network. The vehicles that are in radio range of each other can communicate with one another. Timely message dissemination is extremely important for the delivery of critical information. Generally, data dissemination in VANET is broadcast oriented. Multihop broadcasting can be used to spread emergency messages. In this paper, the proposed work is compared with the existing approaches using NS2. The simulation results show the reduction on transmission delay and improved packet delivery ratio.