StacksVerified U.S. regulatory reference

49 CFR §393.81

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Every bus, truck, truck-tractor, and every driven motor vehicle in driveaway-towaway operations shall be equipped with a horn and actuating elements which shall be in such condition as to give an adequate and reliable warning signal.