PUBLIC LAW 101-549—NOV. 15, 1990 104 STAT. 2455 1990, for areas with a design value above 12.7 ppm at the time of classification, the plan revision shall provide for the implementation of specific measures to be undertaken if any estimate of vehicle miles traveled in the area which is submitted in an annual report under paragraph (2) exceeds the number predicted in the most recent prior forecast or if the area fails to attain the national primary ambient air quality standard for carbon monoxide by the primary standard attainment date. Such measures shall be included in the plan revision as contingency measures to take effect without further action by the State or the Administrator if the prior forecast has been exceeded by an updated forecast or if the national standard is not attained by such deadline. " (4) SAVINGS CLAUSE FOR VEHICLE INSPECTION AND MAINTE- NANCE PROVISIONS OF THE STATE IMPLEMENTATION PLAN.— Immediately after the date of the enactment of the Clean Aii* Act Amendments of 1990, for any Moderate Area (or, within the Administrator's discretion, portion thereof), the plan for which is of the type described in section 182(a)(2)(B) any provisions necessary to ensure that the applicable implementation plan includes the vehicle inspection and maintenance program described in section 182(a)(2)(B). "(5) PERIODIC INVENTORY. — No later than September 30, 1995, and no later than the end of each 3 year period thereafter, until the area is redesignated to attainment, a revised inventory meeting the requirements of subsection (a)(l). " (6) ENHANCED VEHICLE INSPECTION AND MAINTENANCE. — No later than 2 years after the date of the enactment of the Clean Air Act Amendments of 1990 in the case of Moderate Areas with a design value greater than 12.7 ppm at the time of classification, a revision that includes provisions for an enhanced vehicle inspection and maintenance program as required in section 182(c)(3) (concerning serious ozone nonattainment areas), except that such program shall be for the purpose of reducing carbon monoxide rather than hydrocarbon emissions. " (7) ATTAINMENT DEMONSTRATION AND SPECIFIC ANNUAL EMIS- SION REDUCTIONS. — In the case of Moderate Areas with a design value greater than 12.7 ppm at the time of classification, no later than 2 years after the date of the enactment of the Clean Air Act Amendments of 1990, a revision to provide, and a demonstration that the plan as revised will provide, for attainment of the carbon monoxide NAAQS by the applicable attainment date and provisions for such specific annual emission reductions as are necessary to attain the standard by that date. The Administrator may, in the Administrator's discretion, require States to submit a schedule for submitting any of the revisions or other items required under this subsection. In the case of Moderate Areas with a design value of 12.7 ppm or lower at the time of classification, the requirements of this subsection shall apply in lieu of any requirement that the State submit a demonstration that the applicable implementation plan provides for attainment of the carbon monoxide standard by the applicable attainment date. "(b) SERIOUS AREAS.— "(1) IN GENERAL.— Each State in which all or part of a Serious Area is located shall, with respect to the Serious Area, make the submissions (other than those required under subjection
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