42 U.S.C. § 12144
If a public entity operates a demand responsive system, it shall be considered discrimination, for purposes of section 12132 of this title and section 794 of title 29, for such entity to purchase or lease a new vehicle for use on such system, for which a solicitation is made after the 30th day following , that is not readily accessible to and usable by individuals with disabilities, including individuals who use wheelchairs, unless such system, when viewed in its entirety, provides a level of service to such individuals equivalent to the level of service such system provides to individuals without disabilities.
(Pub. L. 101–336, title II, § 224, , 104 Stat. 342.)
Section effective , see section 231(b) of Pub. L. 101–336, set out as a note under section 12141 of this title.