C.R.S. § 18-9-116
18-9-116. Throwing missiles at vehicles - harassment of bicyclists
18-9-116. Throwing missiles at vehicles - harassment of bicyclists. (1) Any person who knowingly projects any missile at or against any vehicle or equipment designed for the transportation of persons or property, other than a bicycle, commits a civil infraction.
(2) Any person who knowingly projects any missile at or against a bicyclist commits a class 2 misdemeanor.
(3) As used in this section, "missile" means any object or substance.