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- W624933478 abstract "The optimum amount and distribution of slack-time on bus and train services varies with route length, loading pattern, rail and road conditions, type of vehicle and fare-collection system. An idealised service is considered and a computer simulation is used to compare different ways of allocating slack-time to a schedule. Irregularity is modelled by the use of an index I equal to the variance of the vehicle headway divided by the mean headway squared. The unstable equilibrium of a bus running late is accounted for in the model. Late-running buses contribute greatly to the formation of bunches. Results suggest that both average and terminal irregularity is minimised if many intermediate timing points are used in a schedule. It was found to be more advantageous to allocate a disproportionately large fraction of any slack-time available in a schedule to the timing points early in a route. Also irregularity is greatly increased by even a slight degree of dependence of trip-time variation on vehicle headway. In practice, it is operationally convenient to have fewer timing points than the results recommended. Often slack-time is preferred only at the terminal, where it can be incorporated into driver layover time. Slack-time elsewhere adds to operating costs, but as the authors show, it can be used to reduce bunching. (TRRL)" @default.
- W624933478 created "2016-06-24" @default.
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- W624933478 date "1981-08-09" @default.
- W624933478 modified "2023-09-27" @default.
- W624933478 title "OPTIMAL DISTRIBUTION OF SLACK-TIME IN SCHEDULE DESIGN" @default.
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