Hybrid genetic algorithm for the open capacitated arc routing problem

The Open Capacitated Arc Routing Problem (OCARP) is an NP-hard arc routing problem where, given an undirected graph, the objective is to find the least cost set of routes that services all edges with positive demand (required edges). The routes are subjected to capacity constraints in relation to edge demands. The OCARP differs from the Capacitated Arc Routing Problem (CARP) since OCARP does not consider a depot and routes are not constrained to form cycles. A hybrid genetic algorithm with feasibilization and local search procedures is proposed for the OCARP. Computational experiments conducted on a set of benchmark instances reveal that the proposed hybrid genetic algorithm achieved the best upper bounds for almost all instances.