a computer simulation model which represents the detailed working of a specific bus service is reported. the service modelled has a cross town route with medium headway (10min) and the round-trip time is approximately 1 1/2 hours. the successful validation of the model against the observed behaviour of the real bus service is described, and the model is then used to estimate the likely effect of applying several control strategies formulated for use in a situation where the exact positions of all buses in service are known. these strategies include the turning of buses to break up bunches: the use of a reserve bus pool to replace late buses; the bypassing of certain bus stops, either to preserve spare seat capacity for later stops, or in an attempt to shorten an over-long headway. all these strategies are shown to be ineffective in the situation simulated. use of a reserve bus to fill gaps arising in the service improves the service, but is less efficient than regular use of the reserve bus in a suitably rescheduled service. making buses wait at certain points on the route if their headway becomes too short, (without reference to the schedule) reduces passenger waiting time and improves regularity, but this benefit is largely overshadowed by the increase in passenger travel time. for the particular route modelled much larger benefits can be achieved by ensuring that buses leave the termini exactly on schedule whenever possible; however, it is possible that the control strategies used would be more effective on a higher frequency, more congested route. (a)

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