105 STAT. 1930 PUBLIC LAW 102-240—DEC. 18, 1991 such quarter. A State may request adjustment to the obligation amounts later in each of such quarters. Acceptance of the notification and certification shall be deemed a contractual obligation of the United States for the payment of the surface transportation program funds expected to be obligated by the State in such quarter for projects not subject to review by the Secretary under this chapter. "(3) PAYMENTS.— The Secretary shall make pa3nnents to a State of costs incurred by the State for the surface transportation program in accordance with procedures to be established by the Secretary. Payments shall not exceed the Federal share of costs incurred as of the date the State requests payments. "(4) POPULATION DETERMINATIONS. — The Secretary shall use estimates prepared by the Secretary of Commerce when determining population figures for purposes of this section. Urban areas. "(f) ALLOCATION OF OBLIGATION AUTHORITY.— A State which is required to obligate in an urbanized area with an urbanized area population of over 200,000 under subsection (d) funds apportioned to it under section 104(b)(3) shall allocate during the 6-fiscal year period 1992 through 1997 an amount of obligation authority distributed to the State for Federal-aid highways and highway safety construction for use in such area determined by multiplying— "(1) the aggregate amount of funds which the State is required to obligate in such area under subsection (d) during such period; by "(2) the ratio of the aggregate amount of obligation authority distributed to the State for Federal-aid highways and highway safety construction during such period to the total sums apportioned to the State for Federal-aid highways and highway safety construction (excluding sums not subject to an obligation limitation) during such period.". (2) CONFORMING AMENDMENT.—The analysis for chapter 1 of such title is amended by inserting after the item relating to section 132 the following: "133. Surface transportation program.". (b) APPORTIONMENT OF SURFACE TRANSPORTATION PROGRAM FUNDS. — (1) IN GENERAL.— Section 104(b)(3) of title 23, United States Code, is amended to read as follows: "(3) SURFACE TRANSPORTATION PROGRAM.— "(A) GENERAL RULE.— For the surface transportation program in a manner so that a State's current percentage share of apportionments is equal to the State's 1987-1991 percentage share of apportionments. For purposes of this paragraph— "(i) a State's current percentage share of apportionments is the State's percentage share of all funds apportioned for a fiscal year under paragraph (1) for the National Highway System, under section 144 for the bridge program, under paragraph (5)(B) for Interstate maintenance, and under this paragraph; and "(ii) a State's 1987-1991 percentage share of apportionments is the State's percentage share of all apportionments and allocations under this title for fiscal years 1987, 1988, 1989, 1990, and 1991 (except appor-
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