C.R.S. § 42-12-403: Special equipment or modification.

(1) Unless the presence of special equipment was a prior condition for sale within Colorado at the time an historic or special interest vehicle was manufactured for first use, the presence of such equipment or device is not required as a condition for current legal use.

(2) Any safety device or safety equipment that was manufactured for and installed on a motor vehicle as original equipment must be in proper operating condition when the vehicle is operated on or for highway purposes.