Colorado has codified a three foot passing requirement in three rules to address the variety of circumstances in which a bicyclist may be overtaken by a motorist. These circumstances are:
In each case the motorist must maintain at least a three foot distance between the side of their vehicle facing the bicyclist, including all mirrors or other projections, and the bicyclist being overtaken.
Sources: Colo. Rev. Stat. §§42-4-1002; 42-4-1003; 42-4-1004
Colorado has no helmet law. It is legal for all persons of any age to operate a bicycle without wearing a helmet unless otherwise provided by a municipal regulation.
Colorado, in conjunction with Bicycle Colorado, offers Share the Road license plates. For more information on such plates please visit: http://bicyclecolo.org/articles/share-the-road-plate-info-pg764.htm
Source: Colo. Rev. Stat. §42-3-226
Colorado does not define who is a "vulnerable road user," but has several statutes aimed at protecting bicyclists specifically. These include:
Sources: Colo. Rev. Stat. §§18-9-116; 42-4-1008.5; 42-4-1402
Colorado currently has the following laws aimed at distracted driving, subject to limited exceptions:
Sources: Colo. Rev. Stat. §§42-4-239; 42-4-1411
Colorado has some of the most specific laws regarding where a bicyclist should ride, and just as importantly, where a bicyclist should not be obligated to ride in the nation. The general rule is that:
If the right-hand lane then available for traffic is wide enough to be safely shared with overtaking vehicles, a bicyclist shall ride far enough to the right as judged safe by the bicyclist to facilitate the movement of such overtaking vehicles unless other conditions make it unsafe to do so. A bicyclist may use a lane other than the right-hand lane when:
A bicyclist shall not be expected or required to:
Source: Colo. Rev. Stat. §42-4-1412(5)
Colorado provides that no person shall drive any vehicle other than a bicycle, electric assisted bicycle, or any other human-powered vehicle upon a sidewalk or sidewalk area, except upon a permanent or duly authorized temporary driveway.
In addition, when a person is riding a bicycle upon a sidewalk, pathway or crosswalk the bicyclist shall:
Sources: Colo. Rev. Stat. §§42-4-710; 42-4-1412(10)
Colorado does not require that bicyclists use any lane or path other than a normal vehicular traffic lane.
In Colorado, bicycles are defined as vehicles. Colorado's law prohibiting driving while under the influence of alcohol or other controlled substances is written so that it applies to all vehicles and therefore applies to bicyclists. Bicycles should not be operated while intoxicated and operating a bicycle while under the influence of alcohol or other controlled substances may result in severe punishments.
Sources: Colo. Rev. Stat. §§42-4-1301; 42-1-102
Colorado provides that its traffic laws shall not be deemed to prevent local authorities, with respect to streets and highways under their jurisdiction and within the reasonable exercise of the police power, except those streets and highways that are parts of the state highway system, from regulating the operation of bicycles and requiring the registration and licensing of same, including the requirement of a registration fee, consistent with state traffic laws.
Source: Colo. Rev. Stat. §42-4-111
Colorado requires that no person open the door of a motor vehicle on the side available to moving traffic unless and until it is reasonably safe to do so and can be done without interfering with the movement of other traffic. In addition, no person shall leave a door open on the side of a vehicle available to moving traffic for a period of time longer than necessary to load or unload passengers.
Source: Colo. Rev. Stat. §42-4-1207
In Colorado bicycles are vehicles according to the statute that defines vehicles and a person riding a bicycle has all of the rights and duties of the driver of a vehicle as provided in Article 42-4.
Source: Colo. Rev. Stat. §§42-1-102(112); 42-4-1412
The laws regulating the operation of bicycles in the state of Colorado are generally found in the Colorado Revised Statutes (Colo. Rev. Stat.), available here http://www.lexisnexis.com/hottopics/Colorado/.
Although it is legal to ride in most parts of the City, there are sections that are posted as Dismount Zones or No Ride areas and can be identified by official traffic signs.
Helmet too far forward
Helmet too far back
Helmet correctly positioned and fastened