trailer at highway speeds. Another benefit of having a sturdy rear underride guard is that it may be secured to a loading dock with a hook to prevent "trailer creep", a movement of the trailer away from the dock, which opens up a dangerous gap during loading or unloading operations. Semi-truck manufacturers Current semi-truck manufacturers include: Asia-Pacific Asia MotorWorks (India) C&C Trucks (China) CAMC Star (China) China National Heavy Duty Truck Group (China) FAW Group (China) Foton Motor (China) Hino Motors (Japan) Hyundai (South Korea) Isuzu (Japan) Mahindra Truck and Bus Division (India) Mitsubishi Fuso Truck and Bus Corporation (Japan) SAIC Iveco Hongyan (China) Tata Daewoo (South Korea-India) Tata Motors (India) UD Trucks (Japan) Canada and United States Crane Carrier Company Freightliner Hino Motors (Canadian plant) Hyundai Translead Kenworth Mack Navistar International Oshkosh Peterbilt Caterpillar Volvo Wabash National Western Star Tesla Europe ADR Group Trailer DAF Trucks Iveco Kamaz KrAZ MAN MAZ Mercedes-Benz Renault Trucks Roman Scania Sisu Tatra Volvo ZiL Jelcz Other locations Al Kowary Industries (Bahrain) Ashok Leyland (India) BharatBenz (India) BMC (Turkey) Eicher Motors (India) Ford Otosan (Turkey) Volkswagen Caminhões e Ônibus (Latin America, South Africa) Driver's license A special driver's license is required to operate various commercial vehicles. Australia Truck drivers in Australia require an endorsed license. These endorsements are gained through training and experience. The minimum age to hold an endorsed license is 18 years, and/or must have held open (full) driver's license for minimum 12 months. The following are the heavy vehicle license classes in Australia: LR (Light Rigid) – Class LR covers a rigid vehicle with a GVM (gross vehicle mass) of more than 4.5 tonnes but not more than 8 tonnes. Any towed trailer must not weigh more than 9 tonnes GVM. Also includes vehicles with a GVM up to 8 tonnes which carry more than 12 adults including the driver and vehicles in Class C. MR (Medium Rigid) – Class MR covers a rigid vehicle with two axles and a GVM of more than 8 tonnes. Any towed trailer must not weigh more than 9 tonnes GVM. Also includes vehicles in Class LR. HR (Heavy Rigid) – Class HR covers a rigid vehicle with three or more axles and a GVM of more than 15 tonnes. Any towed trailer must not weigh more than 9 tonnes GVM. Also includes articulated buses and vehicles in Class MR. HC (Heavy Combination) – Class