Contract authority Funds made available to carry out this section shall be available for obligation and administered in the same manner as if such funds were apportioned under chapter 1 of title 23, United States Code, except that the funds shall remain available until expended and shall not be transferrable. (h) Assistance to Indian tribes In carrying out this section, the Secretary may enter into grant agreements, self determination contracts and self-governance compacts under the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 5301 et seq.) with eligible Indian tribes and such agreements, contracts, and compacts shall be administered in accordance with such Act. (i) Reports (1) Interim report Not later than September 30, 2023, the Secretary shall submit to Congress a report containing the information described in paragraph (3). (2) Final report Not later than September 30, 2025, the Secretary shall submit to Congress a report containing the information described in paragraph (3). (3) Report information A report submitted under this subsection shall contain the following: (A) A list of grants made under this section. (B) Best practices of recipients in implementing active transportation projects. (C) Impediments experienced by recipients of grants under this section in developing and shifting to active transportation. (j) Rule required Not later than 1 year after the date of enactment of this Act, the Secretary shall issue a final rule that encourages the use of the programmatic categorical exclusion, expedited procurement techniques, and other best practices to facilitate productive and timely expenditures for projects that are small, low impact, and constructed within an existing built environment. (k) Authorization of appropriations There is authorized to be appropriated out of the Highway Trust Fund (other than the Mass Transit Account) $500,000,000 for each of fiscal years 2020 through 2024 to carry out this section. (l) Definitions In this Act: (1) Active transportation The term active