Americans with Disabilities Act (ADA) of 1990 (with amendments issued through 2008)

(C) to other individuals, in addition to the one individual described in subparagraph (a), accompanying the individual with a disability provided that space for these additional individuals are available on the paratransit vehicle carrying the individual with a disability and that the transportation of such additional individuals will not result in a denial of service to individuals with disabilities.

For purposes of clauses (i) and (ii) of subparagraph (A), boarding or disembarking from a vehicle does not include travel to the boarding location or from the disembarking location.