We study an extension to the general routing problem, which deals with integrating fixed route service with the general pickup and delivery problem to create a hybrid routing problem. The primary application for such a service is a dial-a-ride system used by transit agencies to transport disabled or elderly individuals. The main aim of the integration is to reduce the vehicle miles of the on-demand vehicles while not significantly reducing the customer service level. Due to the combinatorial nature of the problem, we propose a heuristic algorithm that provides an approximate solution, which is computationally efficient for solving large sized problems. The proposed heuristic is tested using real data from a transit agency.

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