Motorized Scooters. Are you in compliance with the CA law regarding motorized scooters? Here are some highlights: operators must be at least 16 years old; proper helmets must be worn, no passengers are permitted, no hands-free operation, 15 mph maximum speed, no operation on sidewalks. More rules apply as listed on City of Irvine website. Read more HERE. Also, recreational use of scooters is not permitted on Evergreen streets behind garages.