since 1998 since 1998 Air bags in cars since 1998 U.S. Intermodal Surface Transportation Efficiency Act U.S. Intermodal Surface Transportation Efficiency Act Air bags in cars U.S. Intermodal Surface Transportation Efficiency Act U.S. Intermodal Surface Transportation Efficiency Act "Sep 1, 1998: Federal legislation makes airbags mandatory" such as the U.S. law requiring car makers to install air bags U.S. Intermodal Surface Transportation Efficiency Act U.S. Intermodal Surface Transportation Efficiency Act air bags a time before passenger airbags were mandatory