The ADA - Americans with Disabilities Act requires accessible facilities
and is enforced by the U.S. Department of Justice.

 

The Unites States Access Board has developed
Proposed Guidelines for Pedestrian Facilities in the Public Right-of-Way (PROWAC) 2011
with the most complete design guidance at this time.
PDF of the Document

 

ODOT's Resurfacing Policy requires the construction of ADA compliant curb ramps (or "curb cuts" where no sidewalks are present) prior to or in conjunction with any resurfacing.  

 

ODOT Design Standards for Sidewalks and Shared Use Paths are provided in the
Location & Design Manual Volume 1

 

ODOT Curb Ramp and Detectable Warning designs be found in Standard Construction Drawing
BP-7.1

 

Detectable Warnings requirements for use on ODOT Maintained Facilites can be found here