Ehsan Mardan - Master Student, Department of Industrial Engineering, College of Engineering, University of Tehran, Tehran, Iran
Reza Tavakkoli-Moghaddam - Associate Professor, Department of Industrial Engineering, College of Engineering, University of Tehran, Tehran, Iran

In this paper, a vehicle routing problem (VRP) is considered with different considerations, such as capacitated VRP, VRP with backhauling, and VRP with time window. We consider the capacitated VRP with time window and substitute the traditional objective function with a multi-objective function consisting of three objectives: namely, traveling distance cost, traveling time cost, and waiting time cost. Also the problem considers a pickup & delivery problem which each node consists of a pickup terminal and a delivery terminal. The solution methodology is based on genetic algorithms, in which the number of routes are constant and known.

Multi-objective vehicle routing problem, Time window