; (2) in subsection (a) (as so redesignated)— (A) in paragraph (1) (as so redesignated)— (i) by striking (A) conformity to and inserting the following: (A) achieves compliance with ; and (ii) by striking (B) that such activities will and inserting the following: (B) will ; (B) by moving the subsection (as so amended) to appear at the beginning of the section; and (C) by adding at the end the following: (2) Determination estimates For purposes of paragraph (1), a determination regarding the conformity of an activity, project, program, or plan shall be based on the most recent estimates of the emissions of the activity, project, program, or plan, which shall be determined based on the most recent applicable population, employment, travel, and congestion estimates (as determined by the metropolitan planning organization or other agency authorized to make those estimates). ; (3) by redesignating subsections (c) and (d) as subsections (b) and (c), respectively; (4) in subsection (b) (as so redesignated)— (A) by striking the subsection designation and all that follows through No department in the first sentence and inserting the following: (b) Requirement of conformity for Federal assistance (1) Limitations (A) Federal agencies No department ; (B) in paragraph (1)(A) (as so redesignated)— (i) in the first sentence, by striking it has and inserting the implementation plan has ; (ii) in the third sentence, by striking The assurance of conformity to such an implementation plan and inserting the following: (C) Responsibility for assurance The assurance of conformity to an implementation plan approved or promulgated under section 110 ; and (iii) in the second sentence, by striking No metropolitan and inserting the following: (B) Metropolitan planning organizations No metropolitan ; (C) in paragraph (2)— (i) in subparagraph (A), by striking of paragraph (1)(B) and inserting described in subsection (a)(1)(B)