Americans with Disability (ADA) Ramp Requirements

The main ADA requirements that pertain to public sidewalks and sidewalk curb ramps are as follows:

Sidewalk requirements:
- The sidewalk cross slope shall be 2%.
- The minimum clear width of the sidewalk shall be six feet.
- If the longitudinal slope of the sidewalk exceeds 1:20 it is considered a ramp and a level landing must be provided for every 30-inch change in elevation and in some cases handrails may be required.

Sidewalk Curb Ramp requirements:
- A landing must be provided at the top of ramp with slope that does not exceed 2% in any direction.
- The cross slope must not exceed 2%.
- The longitudinal slope must not exceed 1:12.
- The curb flare must not exceed 1:10.
- There shall be no than a ½” lip where the ramp meets the road/gutter.
- The ramp shall have a detectable warning surface that spans the full width of the ramp.

The current MDOT detail R-28-E Sidewalk Ramp and City of Detroit special provision for Sidewalk Ramps are included in this website. All ramps constructed in The City of Detroit are required to meet these design standards. City Engineering is working with contractors, consultants, and other City departments to improve ADA awareness and construction practices.

Following is a link to a website that outlines ADA Accessibility Guidelines:  http://www.access-board.gov/guidelines-and-standards/buildings-and-sites/about-the-ada-standards/background/adaag

Sections 4.3, 4.7, and 4.8 pertain to sidewalks and sidewalk curb ramps.