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The construction, maintenance, and operation of transportation infrastructures are subject to five major types of constraints.

Route selection can rely on a variety of criteria, with the most common being the minimization of costs and the maximization of economic efficiency. The above figure depicts three route selection scenarios where a path must be selected on a grid by linking its bottom left and top right corners.

For routes involving different transportation modes, modal cost differences will influence routing options. The above figure presents a route selection problem between two locations (origin a and destination b) and involving two modes; land and sea. It requires selecting one port out of a choice of four (p1 to p4)

The “traveling salesperson” problem is a classic route selection problem where a sequence of locations has to be traveled to, and a return must be made to the starting location. Each location can only be traveled once. In the above example, a salesperson, starting at point 1, must visit six

Author: Dr. Jean-Paul Rodrigue Transportation seeks to minimize the effort of moving passengers and freight between locations. A component of this effort involves route selection. 1. Route Selection Human beings are natural effort minimizers, notably when it involves moving around. When given the opportunity, they will always try to choose