text: is california the only state where passing on the right is illegal?   passing on the right in california is legal ...  21755.   the driver of a motor vehicle may overtake and pass another vehicle upon the right only under conditions permitting such movement in safety. in no event shall such movement be made by driving off the paved or main-traveled portion of the roadway.  thank you kovneva. it absolutely amazes me that people will actually answer this question incorrectly with the vehicle code cited right in front of them. i really appreciate your support.