Interpretation of Federal Motor Vehicle Safety Standard 208, S4.1.2: ignition interlock deleted 29 October 1974
This interpretation letter from the National Highway Traffic Safety Administration explains how Federal Motor Vehicle Safety Standard 208 changed in 1974. Until 29 October 1974, section S4.1.2 required an ignition interlock on passenger cars of the 1974 and 1975 model years. Recent legislation then mandated the deletion of that requirement, and the agency carried it out. The letter adds that the interlock was not banned, but manufacturers could no longer use it to meet the standard, which moved to lap and shoulder belts in front outboard seats, lap belts in other seats, and a reminder system. This page cites it for what changed and when.
This interpretation letter from the National Highway Traffic Safety Administration explains how Federal Motor Vehicle Safety Standard 208 changed in 1974. Until 29 October 1974, section S4.1.2 required an ignition interlock on passenger cars of the 1974 and 1975 model years. Recent legislation then mandated the deletion of that requirement, and the agency carried it out. The letter adds that the interlock was not banned, but manufacturers could no longer use it to meet the standard, which moved to lap and shoulder belts in front outboard seats, lap belts in other seats, and a reminder system. This page cites it for what changed and when.
Written from the the document, NHTSA.
What our sources record
Recorded when this source was checked, figures included, with page references and quotation marks removed.
NHTSA interpretation letter. https://www.nhtsa.gov/node/127646