If you have a disability and the format of any material on the National Highway Specifications web site interferes with your ability to access some information contained on the site, please email construction@dot.gov. Your email will be referred to the appropriate department or agency for response. To enable us to respond in a manner that will be of most help to you, please indicate the nature of the accessibility problem, your preferred format (electronic format (ASCII, etc.), standard print, large print, etc.), the web address of the requested material, and your full contact information so we can reach you if questions arise while fulfilling your request.

The Adobe Portable Document Format (PDF) files found on this web site will require the Adobe Acrobat Reader software to interpret the page content. Users can get additional information regarding the accessibility of PDF files from the Access Adobe web site.