Section 25254 Of Article 7. Flashing And Colored Lights From California Vehicle Code >> Division 12. >> Chapter 2. >> Article 7.

. In any county with a population of 250,000 or more persons, publicly owned vehicles operated by peace officer personnel of a marshal's department, when actually being used in the enforcement of the orders of any court, including, but not limited to, the transportation of prisoners, may display flashing amber warning lights to the rear when such vehicles are necessarily parked upon a roadway and such parking constitutes a hazard to other motorists.