U.S. Department of Justice
Americans with Disabilities Act
ADA HOME PAGE http://www.usdoj.gov/crt/ada/adahom1.htm

Technical assistance and practical manuals on the ADA provided for both private businesses and public entities. A toll-free number is provided for assistance (800) 514-0301.

US Access Board (also known as the Architectural and Transportation Barriers and Compliance Board or ATBCB) http://www.access-board.gov/
The federal agency that promulgates federal access code on an extensive range of facilities far exceeding that covered by Title 24 CBC. They also provide technical assistance, helpful manuals and they perform on-going research on many pertinent topics. We strongly recommend the US access board (http://www.access-board.gov/prowac/alterations/guide.pdf) for guidance on designing sidewalks, curb ramps and the like. A toll-free number is provided for assistance (800) 872-2253

Federal Highway Administration
http://www.fhwa.dot.gov/civilrights/ada_qa.htm

FHWA provides oversight in conjunction with its State and local transportation department partners to help those who work in designing the public rights-of-way to better understand roles and responsibilities to provide accessible transportation facilities under the Americans with Disabilities Act of 1990 (ADA) and the Rehabilitation Act of 1973 (Section 504). The URL provides a link to questions and answers derived from extensive experience and input from the FHWA Offices of Civil Rights, Infrastructure, Chief Counsel, and Planning, Environment, and Realty. The answers to most questions that municipalities have about the PROW can be answered through the link above.