NETWORK EQUILIBRIUM-MODELS WITH COMBINED MODES

Many trips in urban areas are taken by using more than one mode, such as the so called ''kiss'n ride'' or ''park'n ride'' trips; the first p art of the trip is taken by the private care and then completed by tak ing one or more transit modes. We present in this paper several approa ches to formulating network equilibrium models with combined modes. On e of these approaches results in a new network equilibrium model, wher e the combined mode is considered as a distinct alternative in a deman d model, and the network flows are suitably modelled on different moda l subnetworks. The mathematical structure of the model is analysed and solution algorithms are outlined.