in certain Department of Transportation programs (1) In general Section 313(a) of title 23, United States Code, is amended by striking and manufactured products and inserting manufactured products, and construction materials described in subparagraphs (D) through (I) of section 2(c)(1) of the Made in America Act of 2018 . (2) No effect on iron or steel Nothing in this subsection or an amendment made by this subsection affects section 313 of title 23, United States Code, or the implementation of that section by the Secretary of Transportation with respect to iron or steel.