According to the Colorado Department of Transportation, the basics of the state’s motorcycle helmet laws and other safety requirements are:
Helmets are required for any riders or passengers under the age of 18. While the Department of Transportation encourages all riders to wear a helmet, they are not required for riders age 18 or over.
All riders and passengers must use some form of eye protection while on a motorcycle, such as goggles or glasses. State regulations say that a motorcycle’s windshield does not qualify as sufficient eye protection.
Motorcycles must be equipped with footrests for passengers, and passengers must use these footrests while riding.
Lane-splitting, which is when a motorcycle rides between two lanes of slower traffic, is illegal in Colorado. However, two motorcycles can ride side-by-side and share a lane.