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Section 38603 Of Chapter 8. Recreational Off-highway Vehicles From California Vehicle Code >> Division 16.5. >> Chapter 8.

38603
. (a) A person operating a recreational off-highway vehicle with a model year of 2014 or later shall not allow a passenger to occupy a separate seat location not designed and provided by the manufacturer for a passenger.
  (b) Seats that are installed in a separate seat location not designed and provided by the manufacturer for a passenger in vehicles with model year of 2013 or earlier may be occupied by a passenger if the occupant of the seat is fully contained inside of the vehicle's rollover protection structure at all times while the vehicle is being operated.