[Code of Federal Regulations] [Title 23, Volume 1] [Revised as of April 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 23CFR450.326] [Page 113] TITLE 23--HIGHWAYS CHAPTER I--FEDERAL HIGHWAY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION PART 450_PLANNING ASSISTANCE AND STANDARDS--Table of Contents Subpart C_Metropolitan Transportation Planning and Programming Sec. 450.326 Transportation improvement program: Modification. The TIP may be modified at any time consistent with the procedures established in this part for its development and approval. In nonattainment or maintenance areas for transportation related pollutants if the TIP is amended by adding or deleting projects which contribute to and/or reduce transportation related emissions or replaced with a new TIP, new conformity determinations by the MPO and the FHWA and the FTA will be necessary. Public involvement procedures consistent with Sec. 450.316(b)(1) shall be utilized in amending the TIP, except that these procedures are not required for TIP amendments that only involve projects of the type covered in Sec. 450.324(i).