An accessible route must provide passing spaces at intervals of no more than _____ feet.

The requirement for passing spaces in accessible routes is designed to ensure that individuals using wheelchairs or other mobility devices can navigate the route without having to backtrack or maneuver in a constrained space. According to the Americans with Disabilities Act (ADA) standards, an accessible route must have passing spaces provided at intervals not exceeding 200 feet. This allows for adequate room for two individuals to pass each other comfortably in narrow pathways or corridors, promoting accessibility and safety. Having a passing space every 200 feet means that if a route is longer than that, there are scheduled areas where users can step aside, thereby enhancing mobility for everyone using that route.