California Code, Health and Safety Code - HSC § 40445

Pursuant to its authority under Section 40444 to implement the Air Pollution Emergency Plan of the state board, the south coast district board may adopt rules and regulations to limit the operation of motor vehicles within the south coast district during the period when an air pollution emergency has been called as defined by that plan.  Such rules and regulations shall not apply to the operation of authorized emergency vehicles, as defined in Section 165 of the Vehicle Code, or repair vehicles of a public utility.