| http://www.w3.org/ns/prov#value | - This provision revises the Clean Air Act to provide that the frequency for making conformity determinations on updated transportation plans and TIPs shall be every four years, except in cases in which the metropolitan planning organization (MPO) elects to update a plan or TIP more frequently, or the MPO is required to determine conformity to meet a two-year trigger after the effective date of EPA'
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