Problem statement: Vehicle routing problem determines the optimum route for each vehicle
as a sequence of visiting cities. The problem has been defined as NP-hard and exact solution is relatively
difficult to achieve for real time large scale models. Though several attempts to solve the problem were
made in the literature, new approaches may be tried to solve the problem to further reduce computational
efforts. Approach: In this context this study focuses on maximum utilization of loading capacity and
determines the optimum set of vehicle routes for Capacitated Vehicle Routing Problem (CVRP) by a
Nested Particle Swarm Optimization (NPSO) technique. The algorithm is implemented as Master PSO
and slave PSO for the identification of candidate list and route sequence in nested form to optimize the
model. Results: Benchmarking data set of capacitated vehicle routing is considered for the evaluations.
The total distance of set vehicle route obtained by the new approach is compared with the best known
solution and other existing techniques. Conclusions/Recommendations: The NPSO produces
significant results and computational performance than the existing PSO algorithms. This newly proposed
NPSO algorithm develops the vehicle schedule without any local optimization technique.