; and (B) may not be used by States or local governments for construction purposes. 4002. Highway safety research and development (a) In general Section 403 of title 23, United States Code, is amended— (1) in subsection (h) by striking paragraph (2) and inserting the following: (2) Funding The Secretary shall obligate such sums as are necessary in fiscal year 2021 through 2024 from the funds made available to carry out this section to conduct the research described in paragraph (1).