Operational Feasibility of Timed Transfer in Transit Systems

Abstract

The concept of timed transfer, a scheduling procedure used in transit systems, is explained and examined. In particular, the feasibility of this procedure is evaluated using a simple two‐route case to determine the conditions under which timed transfer provides improved service levels compared to unscheduled transferring. A computer program is developed, which simulates four transfer strategies: (1) unscheduled transfers; (2) scheduled transfers without vehicle waiting; (3) scheduled transfers where the lower frequency bus is held until the higher frequency vehicle arrives; and (4) scheduled transfers when both buses are held until a transfer event occurs. The factors affecting timed transfers are evaluated based on an analysis of simulation results and the development of regression models. Preferred strategies for different route conditions are subsequently described.