The mileage operated by each bus based on the reading of the bus odometer, located on the hub of a rear axle, which usually is read during the daily fueling of the bus. This is the mileage data used to schedule the preventive and planned maintenance. If all the scheduled service is operated, hub miles will be greater than the total schedule miles, due to the additional non-revenue bus moves for maintenance purposes and due to other nonscheduled moves which include the following moves: driver instruction, test trips for proposed service changes, community service events and emergency assistance.

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