Unless another clause sets a different figure (doors, curved ramps and similar), the path's clear width is at least 1000 mm, and nothing may intrude into it: fixtures such as lights, awnings, open windows, telephones and skirtings; essential items such as fire hose reels and extinguishers; or door handles lower than 900 mm above the floor.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.