NOTES: Trucks are taken out of service (OOS) when inspectors find serious violations that warrant the issuance of a vehicle OOS order. There may be data inconsistencies across the 1994–2004 time series. The Bureau of Transportation Statistics obtained the data at different times (see Sources) and was unable to verify the consistency of the entire data series prior to publication.
SOURCES: 1994–1998—U.S. Department of Transportation (USDOT), Federal Motor Carrier Safety Administration (FMCSA), Motor Carrier Management Information System, available at http://www.fmcsa.dot.gov/, as of June 2003. 1999–2000—USDOT, FMCSA, personal communication, Aug. 11, 2003. 2001— USDOT, FMCSA, Roadside Inspection Activity Summary by Inspection Type, available at http://ai.volpe.dot.gov/, as of March 2005. 2002–2004—USDOT, FMCSA, Roadside Inspection Activity Summary by Inspection Type, available at http://ai.volpe.dot.gov/, as of May 2005.