The Vehicular Ad hoc Network (VANETs) is a subclass of mobile communication which occupies maximum of the promising approaches of future intelligent communication systems (ITS). Currently the vehicles which are present in this technology are tremendously increased and that creates several challenges in providing efficient communication. Due to its high speed and random mobility several routing issues and optimization problems are created which increase is the delay and overhead during data transmission. To come these drawbacks in this article an improved VANETs routing with particles swarm optimization to improve the quality-of-service parameters (IVRPSO) are developed. The core modules which are present in the article are RPL protocol-based routing and particles swarm optimization. Through these processes that routing of the high-speed vehicles are standardized and the quality of communication is improvised. The implementation of this network is done in NS3 software and the parameters which are concentrated to analyses the performance are data success rate, network throughput, routing overhead, data loss date and average delay. The simulation output states that from the execution of the varying number of vehicles the performance of the IVRPSO is better than the earlier works concerned with efficiency and data success rate.