OPTIMAL SLACK TIME FOR TIMED TRANSFERS AT A TRANSIT TERMINAL

At transit terminals where two routes interchange passengers, total system costs may be reduced by allowing some slack time in the vehicle schedules to decrease the probability of missed connections. Transfer cost functions are formulated and used to determine optimal slack time for simple systems with transfers between one bus route and one rail line. Some analytical results are derived for empirical discrete and Gumbel distributions of bus arrival times. Relations between the optimal slack times and headways, transfer volumes, passenger time values, bus operating costs, and standard deviations of bus and train arrivals are also developed numerically using normally distributed arrivals. However, the proposed numerical approach can optimize slack times for any observed arrival distributions. The results provide some guidelines on desirable slack times and show that schedule coordination between the two routes is not worth attempting when standard deviations of arrivals exceed certain levels. Possible extensions of this work are suggessted in the last section.

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  • Corporate Authors:

    Institute for Transportation, Incorporated

    1410 Duke University Road
    Durham, NC  United States  27705
  • Authors:
    • Lee, KKT
    • Schonfeld, P
  • Publication Date: 1991-12

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  • Accession Number: 00622015
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 31 1996 12:00AM