Set partitioning based heuristics for interactive routing

The set partitioning model is used as the basis for an interactive approach for solving a broad class of routing problems. A pricing mechanism is developed which can be used with a variety of methods in generating improving solutions. A version of the approach for delivery problems has been implemented via a colorgraphics display. The human aided optimization procedure was tested on the standard 50‐point, 75‐point, and 100‐point test problems of Eilon, Watson‐Gandy, and Christofides [6]. In the case of the first two test problems, the procedure was able to generate the best known solutions. In the 100‐point problem, a better solution was generated than the current best known solution.