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特許 権利維持 In many modern public transport systems, timetables and rostering are generated by computer, with the operators specifying the required operating span, minimum frequencies, route length/time and other such factors. Design of the schedule may aim to make times memorable for passengers, through the use of clock-face scheduling — services departing at regular intervals, at the same times every hour. This is less likely to apply at peak times, when the priority is optimum utilisation of available vehicles and staff.