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 some inconsistencies across the 1993–2003 data. 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: 1993–1998—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. 1999–2001—USDOT, FMSCA, personal communication, Aug. 11, 2003. 2002–2003—USDOT, FMCSA, personal communication, June 22, 2004.