This drawing provides the necessary details to construct an HMA ramp from the end of a raised sidewalk down to an asphalt shoulder.
Many older sidewalks, particularly on bridges, were terminated with an abrupt vertical end. Accessible routes were not a consideration in the decades preceding the adoption of the Americans with Disabilities Act (ADA). Now these pedestrian routes require ramps to be accessible to all users. An added benefit of the sidewalk ramp retrofit is the mitigation of the sheer curb edge which might cause damage to an errant vehicle. The sloped cement concrete curb not only provides a clean edge for the installation of the asphalt ramp, but also provides enhanced delineation during the hours of darkness.
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