Before revision: Design Standards In the US, the Americans with Disabilities Act (ADA) requires a slope of no more than 1:12 for wheelchairs and scooters for business and public use, which works out to of ramp for each of rise.
After revision: Access to the ramp in a wheelchairDesign Standards In the US, the Americans with Disabilities Act (ADA) requires a slope of no more than 1:12 for wheelchairs and scooters for business and public use, which works out to of ramp for each of rise.