Highway engineers and planners designate a shoulder or path as rideable if it meets minimum standards for width, surface quality, and debris clearance. A rideable surface must lack deep ruts, severe washboarding, or steep cross-slopes that would destabilize a two-wheeled vehicle. It is a metric used when assessing active transportation corridors.
Heard on the job
The right shoulder is rideable for about three miles before the pavement breaks up near the bridge.