This lighting information is adapted from the Potomac Pedalers brevet series requirements.
The purpose of the lighting requirement and inspection is to ensure that the cyclist has an adequate set of lights for riding in low and no light conditions. Backup requirements ensure that the cyclist can continue despite a failure of some component of the lighting system. This listing is the minimum requirement by RUSA for ACP and RUSA sanctioned events. Cyclists are responisible for the proper operation of their lighting system.
Also, as stated in the RUSA lighting rules: "Each rider, whether riding in a group or by himself, must fully comply with this requirement. Everyone must use their lights!" Non-compliance with these regulations during low or no light conditions will result in disqualification. Rider safety is paramount.
The performance of reflectors and reflective clothing is discussed on this site.
Primary Lighting System
No specific requirements are made for
a backup system, however
the following are recommended
Most Common Lighting Problems
Make sure that the combination of lights, bulbs, power sources, and backups you choose allows you to tolerate any of these types of failures.