Number of interruptions per 100,000 revenue vehicle-miles
|Motor bus||Light rail||Heavy rail||Commuter rail||Demand response|
NOTES: Data from 1998-2000 and 2001-2008 are not comparable due to a methodology change. Interruptions of service include major and minor mechanical failures. Since 2001, 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.
See glossary for definitions of service types.
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 January 2010; Interruptions of service: USDOT, FTA, National Transit Database, Data Tables, Revenue Vehicle Maintenance Performance, tables 15 and 16 (Washington, D.C.: Annual Issues), available at http://www.ntdprogram.gov/ntdprogram/data.htm as of January 2010.