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 (March 2017):

In March, did not meet the Target; the actual being 3,346 miles. The overall number of breakdowns increased from 611 in February to 748 in March. The number of Engine system failures increased by 19%, that of HVAC failures increased by 84%, that of Cooling system failures increased by 68% and that of Brake system failures decreased by 5%.  


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