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Guide to the ADA Standards

Accessible Parking Spaces [§502]

Requirements for accessible parking spaces address the size and marking of regular and van spaces and access aisles, surfaces, vertical clearance at van spaces, identification, and connecting accessible routes.

Accessible Routes and Access Aisles

Accessible parking space with access aisle adjoined by a curb ramp with a top landing 36” deep min. Accessible route from access aisle on curb ramp and sidewalk highlighted. Notes: Accessible routes must connect directly to access aisles. Curb ramps, where provided, cannot protrude into access aisles (which cannot slope more than 1:48 max.) to accommodate wheelchair transfers and vehicle ramps or lifts (§502.4). A landing at least 36” deep is required at the top of curb ramps; in alterations where space for this landing is unavailable, curb ramps must have side flares with a 1:12 max. slope (§406.4). Bollards, signs, columns, or other elements cannot be located in the access aisle or reduce the minimum clear width of accessible routes. Spaces and aisles must be designed so that parked vehicles do not obstruct the required clear width of adjacent accessible routes (§502.7). Detail: Parallel curb ramp with landing 48” min long, 60” preferred. Note: Where space for curb ramps is limited, including in alterations, parallel ramps can provide an alternative.

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Recommendation:  Configure accessible routes so that they run in front of, instead of behind, parking spaces.

Accessible Parking Space

Two accessible parking spaces 8’ wide min. with an access aisle in between that is 5’ wide min. and as long as the space. Notes: Vehicle Spaces (§502.2) Spaces must be marked to define the 96” minimum width. Access Aisle (§502.3) An access aisle at least 60” wide and at least as long as the parking space is required on either side of the parking space and must be marked to discourage parking in it. Two spaces can share one aisle. Access aisles cannot overlap vehicular ways. Surfaces (§502.4) Parking spaces and access aisles must meet requirements for floor and ground surfaces (§302) and cannot have changes in level other than slopes not exceeding 1:48. Markings (§502.1, §502.2, §502.3.3) Both the parking space and access aisle must be marked. The marking method and color is not specified in the Standards, but may be addressed by state or local codes or regulations. Detail: width measured to centerline of marking. Note: The width of spaces and aisles is measured to the centerline of markings (but it can include the full width of lines where there is no adjacent parking space or aisles).

Source: Guide to the ADA Standards by U.S. Access Board - published 02/2014

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