Enforcement Mobile Vehicles and Equipment ProgramsCargo Tank Vapor RecoveryDiesel Enforcement Heavy-Duty Diesel Inspection & Periodic Smoke Inspection Programs California Racing VehiclesPortable Equipment Registration Program (PERP) Fuels Enforcement Program Popular ResourcesMobile Source Executive OrdersOther Areas of Mobile Source EnforcementOn- and Off-Road Motorcycle Certification Enforcement ProgramGoods Movement Enforcement Program Related ProgramsLarge Spark-Ignition (Gasoline and LPG) EquipmentOff-Highway Recreational Vehicles School Bus Idling Airborne Toxic Control MeasureSmall Off-Road Engines (SORE) Heavy-Duty Inspection and Maintenance ProgramVapor RecoveryReturn to Enforcement.