Equipment of Off-highway VehiclesEquipment
Section § 38365
This law requires all off-highway vehicles to have a working muffler at all times to reduce noise, and it cannot have any modifications that bypass the muffler system. However, this rule doesn't apply when these vehicles are part of organized racing or competitive events conducted on closed courses, as long as the event is sanctioned or permitted by local authorities.
Section § 38366
This law requires off-highway motor vehicles to have a spark arrester when used on forest, brush, or grass-covered land. A spark arrester is a device that prevents the vehicle from igniting flammable materials and must be in good working order. The device fits to the exhaust and should prevent flames or heat from escaping. However, vehicles in organized races on closed courses are exempt if the event has a proper permit from the relevant fire authority.
Section § 38370
This law sets noise limits for off-highway vehicles, like dirt bikes, in California. The noise limits vary based on when the vehicle was made. Vehicles made before 1973 must not exceed 92 dBA, while those made on or after January 1, 1986, are limited to 82 dBA, among other limits for other years. Sellers can't sell new vehicles that exceed these noise limits unless they comply with EPA noise standards. Test procedures to measure noise are overseen by the California Highway Patrol and informed by the Society of Automotive Engineers' standards.
A silencer must be attached to these vehicles to ensure they meet noise regulations. As of 2003, competition vehicles made after 1998 can't exceed 96 dBA. For models made before 1998, the limit is 101 dBA. All other off-highway vehicles must meet similar noise limitations depending on the manufacturing year.
Manufacturers must provide certain technical data to state authorities before selling new models to help enforce these noise regulations. Additionally, the Department of Parks and Recreation reviews and possibly updates these noise regulations over time.
Section § 38375
This law states that off-highway vehicles, like dirt bikes or ATVs, cannot have or use a siren unless they are authorized emergency vehicles. It also specifies that drivers of these vehicles, except those driving emergency vehicles under special permission, are not allowed to use sirens.
Section § 38380
This law allows local authorities and state or federal agencies to require extra equipment on vehicles being driven off-road under certain conditions like fire hazards or public safety concerns. If extra equipment is needed, the agency in charge must clearly post the requirements so that off-road vehicle operators are informed of what's required in those specific areas.