The role of mechanical failure in automobile accidents is examined by comparing motor vehicle mortality among men, age 45 to 54, in states which do and do not require motor vehicle inspection. Inspection is associated with lower mortality, and this association prevails under varying economic, geographic, and demographic conditions. Furthermore, comparison of white to nonwhite death rates reveals that nonwhites are at consistently greater risk.
Buxbaum RC, Colton T. Relationship of Motor Vehicle Inspection to Accident Mortality. JAMA. 1966;197(1):31-36. doi:10.1001/jama.1966.03110010083020