Subject to paragraph (2), any relief that the President provides under this section may not be in effect for more than 2 years.
Subject to subparagraph (C), the President, after receiving a determination from the Commission under subparagraph (B) that is affirmative, or which contains a determination that the President may treat as affirmative in accordance with section 1330(d)(1) of this title, may extend the effective period of relief provided under this section by up to an additional 4 years, if the President determines that the provision of the relief continues to be necessary to remedy or prevent material harm.
Upon request of the President, or upon the filing by an interested party described in subparagraph (A), (B), or (C) of section 4571(8) of this title which is representative of a United States long-haul trucking services industry that is filed with the Commission not earlier than the date that is 270 days, and not later than the date that is 240 days, before the date on which any action taken under this section is to terminate, the Commission shall conduct an investigation to determine whether action under this section continues to be necessary to remedy or prevent material harm.
Any relief provided under this section, including any extension thereof, may not, in the aggregate, be in effect for more than 6 years.
The Commission and the Secretary of Transportation are authorized to promulgate such rules and regulations as may be necessary to carry out this part.