Colorado · Colorado Revised Statutes — Title 42, Vehicles and Traffic
C.R.S. Title 42 § 42-4-222: The driver of a motor vehicle, when reasonably necessary to ensure safe operation, shall give audible warning with the horn but shall not otherwise use such horn when upon a highway
What this law says, in plain English
Motor vehicle drivers may only use horns when necessary for safe operation. Vehicles cannot have other audible devices except theft alarms, backing warnings, and emergency vehicles under specific conditions. Bicycles and scooters cannot have sirens or whistles.
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