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Parking Space Slopes Exceeding the Allowable Slopes

Posted in: Truckstop Business, Thought Leader, Americans with Disabilities Act


Welcome to the newest post in our blog series, Top 20 ADA Compliance Issues Seen in Truckstops and Travel Plazas. Join guest post by contributor Brad GaskinsThe McIntosh Group on the second Friday of every month for his monthly column.

/// Guest post by contributor Brad GaskinsThe McIntosh Group

Last month we discussed a study that found 95 percent of all ADA lawsuits filed contain an issue regarding parking spaces. We’ll continue our series on the top 20 Americans with Disabilities Act (ADA) compliance issues seen in truck stops and travel plazas by discussing parking space slopes.

In section 502.4 of the 2010 ADA Standards for Accessible Design it states that slopes not steeper than 1:48 (2 percent) shall be permitted. Access aisles shall be the same level as the parking spaces they serve. Changes in level are not permitted.

Built-up curb ramps are not permitted to project into access aisles and parking spaces because they would create slopes greater than 2 percent.

Car parking spaces shall be 96 inches wide minimum and van parking shall be 132 inches wide minimum, shall be marked to define the width and shall have an adjacent access aisle.


As with parking spaces access aisles are required to be level in all directions to provide a surface for wheelchair transfer to and from vehicles. The slope, allowing for drainage, cannot be steeper than 2 percent. Below are some additional requirements for access aisles.

  • Access aisles serving car and van parking spaces shall be 60 inches wide minimum.
  • Access aisles shall extend the full length of the parking spaces they serve.
  • Access aisles shall be marked so as to discourage parking in them.
  • Access aisles shall not overlap the vehicular way.
  • Access aisles shall be permitted to be placed on either side of the parking space except for angled van parking spaces which shall have access aisles located on the passenger side of the parking spaces.
  • Two parking spaces shall be permitted to share a common access aisle. Access aisles shall adjoin an accessible route.
  • Accessible routes must connect parking spaces to accessible entrances. 

I look forward to continuing this series next month when we’ll discuss curbs ramps along accessible routes with greater than the allowable slopes. 

Photo Credit: The McIntosh Group

/// Read more Top 20 ADA Compliance Issues Seen in Truckstops and Travel Plazas posts here


Gaskins was a Human Library expert at The NATSO Show. The NATSO Show 2014 will be January 25-29 in Nashville, TN. Learn more about The NATSO Show 2014 here.

{Guest Post} Guest post provided by NATSO Allied member Brad GaskinsThe McIntosh Group. The McIntosh Group is an architecture firm focused on providing accessibility solutions for clients nationwide. Learn more about The McIntosh Group.

The opinions and advice given by guest post contributors are not necessarily those of NATSO Inc. The posts should not be considered legal advice. Qualified professionals should be sought regarding advice and questions specific to your circumstances.

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About the Author

Brad Gaskins, AIA, CASp

Brad Gaskins, AIA, CASp

Brad has more than 25 years experience in the practice of architecture and a comprehensive understanding of professional practice nationwide. Brad brings a unique and valuable perspective to The McIntosh Group’s practice and clients, with a specific expertise in the Americans with Disabilities Act (ADA) and national building codes.  Brad has gained recognition as an expert witness for clients with ADA compliance complaints. He represents NACS, The Association for Convenience and Fuel Retailing, as a full voting member on the International Code Council (ICC), American National Standards Institute (ANSI) A117.1, Consensus Committee on Accessible and Usable Buildings and Facilities. His objective is to share, with the committee for their deliberations, the potential impact of the standards on the convenience store and truckstop industry. Brad has an undergraduate degree in engineering and a master’s degree in architecture from the University of Oklahoma. He is currently serving as president of AIA Oklahoma. 

Got questions about ADA guidelines? Let Brad help, he’s the ADA Geek.


The “Ask Brad” website educates visitors on the Americans with Disabilities Act (ADA). The site offers the knowledge of an architect, Brad, who has a specific expertise in ADA compliance. Visitors to the site are encouraged to submit questions regarding the ADA. Brad will answer the questions and post them to the site for all to take advantage. In addition to the Q&A section, the site offers timely information through instructional videos, white papers, articles and resource links.


Please visit the site at