PUBLIC LAW 105-178-JUNE 9, 1998 112 STAT. 145 . as of the date of the study, are not addressed by the program. (2) REPORT. —Not later than January 1, 2000, the National Academy of Sciences shall transmit to the Secretary, the Committee on Transportation and Infrastructure and the Committee on Commerce of the House of Representatives, and the Committee on Environment and Public Works of the Senate a report on the results of the study with recommendations for modifications to the congestion mitigation and air quality improvement program in light of the results of the study. (3) FUNDING.— Before making the apportionment of funds under section 104(b)(2) of title 23, United States Code, for each of fiscal years 1999 and 2000, the Secretary shall deduct from the amount to be apportioned under such section for such fiscal year, and make available, $500,000 for such fiscal year to carry out this subsection. SEC. 1111. FEDERAL SHARE. (a) STATE-DETERMINED LOWER FEDERAL SHARE.— Section 120 of title 23, United States Code, is amended— (1) in subsection (a)— (A) by striking "Except" and inserting the following: "(1) IN GENERAL.— Except"; (B) by adding at the end the following: "(2) STATE-DETERMINED LOWER FEDERAL SHARE.— In the case of any project subject to paragraph (1), a State may determine a lower Federal share than the Federal share determined under such paragraph."; and (C) by aligning the remainder of the text of paragraph . (1) (as designated by subparagraph (A) of this paragraph) with paragraph (2) of such subsection (as added by subparagraph (B) of this paragraph); and (2) in subsection (b) by adding at the end the following: "In the case of any project subject to this subsection, a State may determine a lower Federal share than the Federal share determined under the preceding sentences of this subsection.". (b) INCREASED FEDERAL SHARE FOR CERTAIN SAFETY PROJECTS. —The first sentence of section 120(c) of such title is amended by inserting "or transit vehicles" after "emergency vehicles". (c) CREDIT FOR NON-FEDERAL SHARE. —Section 120 of such title is amended by adding at the end the following: "( j) CREDIT FOR NON-FEDERAL SHARE.— "(1) ELIGIBILITY.— ^A State may use as a credit toward the non-Federal share requirement for any funds made available to carry out this title (other than the emergency relief program authorized by section 125) or chapter 53 of title 49 toll revenues that are generated and used by public, quasipublic, and private agencies to build, improve, or maintain highways, bridges, or tunnels that iserve the public purpose of interstate commerce. Such public, quasi-public, or private agencies shall have built, improved, or maintained such facilities without Federal funds. " (2) MAINTENANCE OF EFFORT.— "(A) IN GENERAL. — The credit for any non-Federal share provided under this subsection shall not reduce nor replace
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