Certain vehicular signs are permitted so long as they are either a temporary sign posted only during the shift of a delivery person identifying the company for which they are delivering for. Signs painted directly onto the body of the vehicle that advertises a bona fide business. Magnetic sign affixed to the body of the vehicle so long as it is no greater than "one (1) foot" by "two (2) feet" and does not violate Section 1140.17.