Cal. VEH § 336

“General public paratransit vehicle” means any motor vehicle designed for carrying no more than 24 persons and the driver, that provides local transportation to the general public, including transportation of pupils at or below the 12th-grade level to or from a public or private school or school activity, under the exclusive jurisdiction of a publicly owned and operated transit system through one of the following modes: dial-a-ride, subscription service, or route-deviated bus service. Vehicles used in the exclusive transportation of disabled persons as defined in Section 99206.5 of the Public Utilities Code, or of persons 55 years of age or older, including any persons necessary to provide assistance to these passengers, are not general public paratransit vehicles.

However, transportation of attendants, companions, or both traveling together with those individuals with disabilities who are determined to be eligible for complementary paratransit services in accordance with Title II of the Americans with Disabilities Act of 1990 (Public Law 101-336) and federal regulations adopted pursuant thereto, shall not be sufficient to qualify a vehicle as a general public paratransit vehicle.

A vehicle that provides local transportation for the general public through one of the following modes: dial-a-ride, subscription service, or route-deviated bus service, but does not provide transportation of pupils at or below the 12th-grade level to or from a public or private school or school activity, is a transit bus, as defined by Section 642, and is not a general public paratransit vehicle.