engleski

A Combined Model for Intermodal Networks with Variable Transit Frequencies

This paper presents the formulation and solution of a combined mode choice/assignment, intermodal network equilibrium model with asymmetric link cost interactions. Auto, bus and rail are the modes considered as travel options in the proposed formulation, along with the combined auto-to-bus and auto-to-rail intermodal options. Using park-and-ride facilities as transfer points, travelers may switch from auto to transit. There is a two-way interaction between auto and bus transit. The presence of transit vehicles on the highway links is registered through a bus-car equivalency factor, while the transit travel time dependents on the highway link congestion level. Transit travel times are also subject to congestion at the transit stops, due to boarding and alighting. Transit frequencies vary depending on the level of congestion. The solution algorithm for the variational inequality and the derivation of the decent direction for the diagonalized problem are also presented. A test network is developed and several tests are presented to show the convergence of the algorithm as well as the changes in the transit level-of-service due to transit and highway congestion.

combined model; intermodal; park-and-ride; transit; algorithm; convergence; transportation; variational inequality

nije evidentirano