The UCR Agreement is found in 49 United States Code (USC) section 14504a (hereinafter referred to as section 14504a or § 14504a).

The UCR Agreement is established by federal law in the UCR Act, which is part of the federal highway reauthorization bill known as the Safe, Accountable, Flexible, Efficient Transportation Equity Act, A Legacy for Users (“SAFETEA-LU”), Public Law 109-59, enacted August 10, 2005. The UCR Act is sections 4301 through 4308 of SAFETEA-LU. In particular, the structure of the UCR Agreement is set forth in section 4305 of the UCR Act, which enacts §14504a as a new section in 49 USC.

The UCR Agreement has been amended under Section 301 of the SAFETEA-LU Technical Corrections Act of 2008, Public Law 110-244, enacted June 6, 2008, and in the Rail Safety Improvement Act of 2008, Public Law 110-432, enacted October 16, 2008.