R402 — Protruding Objects and Vertical Clearance
R402.1 General. Protruding objects and vertical clearance shall comply with R402. R402.2 Protrusion Limits. Objects with leading edges more than 27 inches (685 mm) and less than 80 inches (2030 mm) above the walking surface shall not protrude horizontally more than 4 inches (100 mm) into pedestrian circulation paths. Exception: Handrails shall be permitted to protrude 4 1/2 inches (115 mm) maximum. R402.3 Post-Mounted Objects. Where objects are mounted on posts or pylons, they shall comply with R402.3. Exception: The sloping portions of handrails serving stairs and ramps shall not be required to comply with R402.3. R402.3.1 Objects Mounted on Single Post or Pylon. Where objects are mounted on a single post or pylon and the objects are more than 27 inches (685 mm) and less than 80 inches (2030 mm) above the walking surface, the objects shall not protrude into the pedestrian circulation path more than 4 inches (100 mm) measured horizontally from the post or pylon or more than 4 inches (100mm) measured horizontally from the outside edge of the base where the base height is 2 1/2 inches (64 mm) minimum. R402.3.2 Objects Mounted Between Posts or Pylons. Where objects are mounted between posts or pylons and the clear distance between the posts or pylons is greater than 12 inches (305 mm), the lowest edge of the object shall be 27 inches (685 mm) maximum or 80 inches (2030 mm) minimum above the walking surface. Exception: Objects mounted with the lowest edge greater than 27 inches (685 mm) and less than 80 inches (2030 mm) above the walking surface are permitted if a barrier with its lowest edge at 27 inches (685 mm) maximum above the walking surface is provided between the posts or pylons. R402.4 Vertical Clearance. Vertical clearance shall be 80 inches (2030 mm) high minimum. Guards or other barriers to prohibit pedestrian travel shall be provided where the vertical clearance is less than 80 inches (2030 mm) high above the walking surface. The lowest edge of the guard or barrier shall be located 27 inches (685 mm) maximum above the walking surface. R402.5 Required Clear Width. Protruding objects shall not reduce the clear width required for pedestrian access routes.