49 CFR 630.4: Requirements.

(a) National Transit Database Reporting System. Each applicant for and beneficiary of Federal financial assistance under 49 U.S.C. chapter 53 must comply with the applicable requirements of 49 U.S.C. 5335, as set forth in the reference documents.

(b) Copies. Copies of reference documents are available from the National Transit Database Web site located at http://www.ntdprogram.gov. These reference documents are subject to periodic revision. Revisions of reference documents will be posted on the National Transit Database Web site and a notice of any significant changes to the reporting requirements specified in these reference documents will be published in the Federal Register.