The p-hub median location problem with multiple service level

Hubs are key points in the hub-and-spoke networks as they play a significant role in manyto- many distribution systems with mass traffic. In this paper we address a time definite model for multiple allocation p-hub median problem with multiple service level reflecting competitive pressures. Limited maximum travel distance via the hub network for each origin-destination pair acts as service level. Computational results tested on the CAB data set are reported to show the effects of multiple service level on network structure