California Code, Health and Safety Code - HSC § 12651

Any person holding a valid license for the manufacture, wholesale, or import and export of dangerous fireworks or pyrotechnic devices may transport any class of fireworks or pyrotechnic devices authorized by such license. Persons holding a special effects pyrotechnic operators license may transport special effects fireworks, but the transportation of fireworks by all other pyrotechnic operator licensees shall not be permitted. The authority granted to the licensee to transport fireworks is limited to traveling upon the approved routes for the transportation of explosives designated as provided in Section 31616 of the Vehicle Code. The licensee shall also comply with Section 27903 of the Vehicle Code and equip and maintain any vehicle used to transport fireworks as required by Section 31610 of the Vehicle Code. It is the intent of the Legislature by this section to require the maximum use of the approved routes in the delivery of fireworks to the point of destination.