ART Fleet Mean Distance between Failures (MDBF).
|Year||MDBF (Miles)||Average Fleet Age (Years)|
Mean Distance between Failures (MDBF) is a transit industry standard that measures the mechanical reliability of an agency's fleet by tracking the mean distance between bus breakdowns or failures. A mechanical failure is any incident that precludes a revenue vehicle from completing its trip or beginning its next scheduled trip.
MDBF is an important measure of the success of the agency's maintenance department and the investment in newer buses which are less prone to maintenance issues. When vehicles break down, interruptions in service, and delays for transit passengers typically occur. This measure supports the MTP Goal 5: Manage Effectively and Efficiently and Goal 1: Provide High‐Quality Transportation Services.
Though ART does not currently have an MDBF standard, Metrobus currently uses a standard of 8,000 miles. ART has performed consistently better than the Metrobus standard since Fiscal Year 2011. Since Fiscal Year 2012, ART's MDBF has increased slightly from 11,268 miles to 11,938 miles.
- ART Transit Operations internal data.