(2) In situations not involving an imminent threat, an adult accompanying someone who uses sign language may be relied upon to interpret or facilitate communication when a) the individual requests this, b) the accompanying adult agrees, and c) reliance on the accompanying adult is appropriate under the circumstances. This exception does not apply to minor children.
Another federal agency, the Architectural and Transportation Barriers Compliance Board (ATBCB), also known as the Access Board, issues guidelines to ensure that buildings, facilities and transit vehicles are accessible to people with disabilities. The Guidelines & Standards issued under the ADA and other laws establish design requirements for the construction and alteration of facilities. These standards apply to places of public accommodation, commercial facilities, and state and local government facilities.
Permanent injunction requiring a change in corporate polices to cause Defendant’s website to become, and remain, accessible Noted was that “The ADA expressly contemplates the type of injunctive relief that the Plaintiffs seek in this action.” The Plaintiff’s lawyers stated that “Because Defendant’s Website has never been accessible and because Defendant does not have, and has never had, a corporate policy that is reasonably calculated to cause its Website to become and remain accessible”. Therefor the Court should require that the Plaintiff accept who the Defendant will use to “assist it in improving the accessibility of its Website”, “ensure that all employees involved in website development and content development be given training”, “Consultant to perform an automated accessibility audit on a periodic basis to evaluate if the Defendant’s Website continues to comply”, “Consultant to perform end-user accessibility/usability testing on a periodic basis”, “Consultant to create an accessibility policy”. Although the Lawyers asked the Court for the above, and it would be extremely time consuming and expensive for the Defendant, the very last part of the Complaint was what the Lawyers were after. Here is what the Lawyers asked the Court for:
This guidance document is not intended to be a final agency action, has no legally binding effect, and may be rescinded or modified in the Department's complete discretion, in accordance with applicable laws. The Department's guidance documents, including this guidance, do not establish legally enforceable responsibilities beyond what is required by the terms of the applicable statutes, regulations, or binding judicial precedent.
Another important consideration is that the ADA does not allow businesses to simply provide an alternative such as a phone number. Lastly, include accessibility issues as part of your website and mobile strategy. When new technologies are implemented or pages added, part of the process should include the implications for persons with disabilities. 
@Rick, I didn't specifically look at doctype, but Steve Faulkner did in his original article (see the link at the top of this post). He found that 101 of the 130 pages containing role="main" (78%) used the HTML5 doctype, which of course leaves 22% that didn't. I do recommend using ARIA even if using an earlier doctype. Validation is important, but if validation and accessibility conflict, I think most would agree accessibility should trump validation. Assistive technologies that support ARIA landmarks do so regardless of doctype, and otherwise the presence of these role attributes has no ill effects in any user agent.
Finally, WA11Y is another top ADA compliance plug-in to consider. A toolbox of resources to help you meet most ADA compliance needs, the plug-in packs multiple accessibility tools, each with a unique purpose. Tota11y, the first tool in the box, for instance, annotates all elements of your web pages and identifies any accessibility issues. Another tool in the box, WAVE, performs a detailed accessibility analysis of each page and provides printable reports. Then, you have FILTERS which is used to modify data within Wa11y.
Web accessibility addresses the needs of every website visitor to achieve an optimal level of usability and ADA compliance. Many people browsing the web have a permanent disability (visual, mobility or neurological impairment), or a temporary impairment such as a broken arm, broken or lost eyeglasses, and so on. Many baby boomers have aging-related issues that make using the web more challenging, and they’re not alone–about 20% of the U.S. population has an identified disability.
The Federal Communications Commission (FCC) enforces regulations covering telecommunication services. Title IV of the ADA covers telephone and television access for people with hearing and speech disabilities. It requires telephone and Internet companies to provide a nationwide system of telecommunications relay services that allow people with hearing and speech disabilities to communicate over the telephone.