Number of interruptions per 100,000 revenue vehicle-miles
|Motor bus||Light rail||Heavy rail||Commuter rail||Demand response|
NOTES: Interruptions of service include major and minor mechanical failures. If the vehicle operator was able to fix the problem and return the vehicle to service without assistance, the incident has not been considered an interruption of service.
A Motor bus is a rubber-tired, self-propelled, manually steered bus with a fuel supply onboard the vehicle. Motorbus types include intercity, school, and transit. Light rail is a streetcar-type vehicle operated on city streets, semi-exclusive rights-of-way, or exclusive rights-of-way. Service may be provided by step-entry vehicles or by level boarding. Heavy rail is an electric railway with the capacity to transport a heavy volume of passenger traffic and characterized by exclusive rights-of-way, multicar trains, high speed, rapid acceleration, sophisticated signaling, and high-platform loading. Also known as "subway," "elevated (railway)," or "metropolitan railway (metro)."
Commuter rail is urban passenger train service for short-distance travel between a central city and adjacent suburb. Does not include rapid rail transit or light rail service. Demand response is comprised of passenger cars, vans, or small buses operating in response to calls from passengers or their agents to the transit operator, who then dispatches a vehicle to pick-up the passengers and transport them to their destinations. This service is also known as dial-a-ride or paratransit.
SOURCES: U.S. Department of Transportation (USDOT), Research and Innovative Technology Administration, Bureau of Transportation Statistics, calculations based on various data; Revenue vehicle-miles: USDOT, Federal Transit Administration (FTA), National Transit Database, National Transit Summaries and Trends (Washington, D.C.: Annual Issues), available at http://www.ntdprogram.gov/ as of December 2010; Interruptions of service: USDOT, FTA, National Transit Database, Data Tables, Revenue Vehicle Maintenance Performance, table 16 (Washington, D.C.: Annual Issues), available at http://www.ntdprogram.gov/ntdprogram/data.htm as of December 2010.