As it is intended to concentrate on VRPTW, literature
survey will focus on VRPTW and its solution methods. In
VRPTW each customer has an associated, fixed time
interval during which service must be provided. A lot of
work has been done in the field of VRPTW [2, 3]. As
VRPTW is NP hard, techniques like exact optimization
and heuristics approaches have been used for solving
VRPTW. In [19], author categorized vehicle routing
methods into three generations. The first generation was