There are no specific requirements. They must be on an accessible route and within appropriate reach ranges. This could mean the requirement of a compliant curb ramp or ramp depending on the circumstances. The accessible route must be a minimum of 36” wide and a 30×48 clear floor space is required at the accessible mail boxes.
Thank you for reaching out. While not ideal it could be possible to design a ramp that will comply with the ADA requirements. There is no explicit provision prohibiting a curved ramp. The specific issue will be getting the cross slope correct such that you don’t end up with a wheel off the ground.
-Tish K. ANSWER: Tish, As long as you provide a passenger loading zone in compliance with the ADA Standards, you should be OK. The ADA Standards have an exemption from the requirement to provide accessible parking spaces for those parking spaces used exclusively for: Buses Trucks Other delivery vehicles Law enforcement vehicles Vehicular impound …when such lots provide a … READ MORE