First, California Health and Safety Code (HSC) sections 25250.50 et.seq. only applies to brake friction materials for “vehicles” as defined in the California Vehicle Code. There are specific exemptions listed in HSC section 25250.55. There are no specific exemptions for “heavy duty” vehicles under the California law. However, some off-highway vehicles may not be included under the California Law. HSC section 25250.50(f) states that “Motor vehicle” and “vehicle” have the same meaning as the definition of “Vehicle” in Section 670 of the Vehicle Code (HSC section 25250.50(f)). Further, California Vehicle Code section 670 defines “vehicle” as “a device by which any person or property may be propelled, moved, or drawn upon a highway, excepting a device moved exclusively by human power or used exclusively upon stationary rails or tracks.” (California Vehicle Code section 670 emphasis added). What types of vehicles may or may not be drawn upon a highway are governed by the California Vehicle Code.