When are bicyclists allowed to ride two abreast in a traffic lane?

Bicyclists are allowed to ride two abreast in a traffic lane when the lane is of substandard length. A substandard lane is typically considered to be less than 14 feet wide. In such lanes, riding two abreast is permissible as it can provide better visibility and reduce the risk of accidents, as it encourages the riders to maintain a tighter formation. This situation allows cyclists to assert themselves more safely on the road, as opposed to riding single file in a narrow lane where it may be difficult for vehicles to pass safely.

In contrast, riding two abreast in heavy traffic or when accompanied by a vehicle does not provide a sufficient basis for allowing this practice, as it could create confusion or danger for both the cyclists and drivers. On a designated bike path, cyclists typically have their own space that doesn’t necessitate riding alongside other vehicles, making the question of riding two abreast less relevant.