Pub. L. 105-178, tit. IV, sec. 4007 (as amended)
WAIVERS, EXEMPTIONS, AND PILOT PROGRAMS.
SEC. 4007. WAIVERS, EXEMPTIONS, AND PILOT PROGRAMS.
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(d) Protection of Existing Exemptions.—The amendments made by this section shall not apply to or otherwise affect a waiver, exemption, or pilot program in effect on the day before the date of enactment of this Act under chapter 313 or section 31136(e) of title 49, United States Code.