ADAAG Manual

Edge Protection

ADAAG addresses drop-offs along ramps and ramp landings but not along other portions of accessible routes or circulation paths. While building codes address drop-offs over certain depths, even shallow drop-offs can disrupt access along narrow routes when a wheelchair slips off the edge. Deeper drop-offs can pose a tipping hazard. Recommendation: At narrow routes in particular, consider maintenance of adjacent surfaces as raised or flush or wider route widths in consideration of minimum maneuvering and passage requirements (i.e., at least 48 inches is considered necessary for a person walking and a person using a wheelchair to pass). For deep drop-offs along level routes, requirements for ramps (see 4.8) can be used as a guide in providing adequate edge protection.