Key Performance Indicators

Bus Mean Distance Between Failures

Definition: An industry standard that measures the mechanical reliability of the fleet. It measures the average bus miles between National Transit Database (NTD) reportable mechanical failures i.e., incidents precluding a revenue vehicle from completing its trip, or starting its next scheduled trip. Currently, all mechanical breakdowns are counted as failures, thus exceeding the number of failures reported to NTD. 

Performance (October 2016):

In October, did not meet the Target; the actual being 3,592 miles. The overall number of breakdowns decreased from 750 in September to 666 in October. The number of Engine system failures decreased by 11%, that of HVAC decreased by 41%, that of Cooling system increased by 15% and that of Brake system increased by 6%.  


  1. Continue conducting troubleshooting refresher training at all garages
  2. Replace coolant sensors and defroster valves on selected bus models