2022 Update: CDL Prep & Practice Test is a free app to prepare you for the CDL test. With a regular driving license, you can not drive large or heavy vehicles. A CDL - commercial driver's license is required to drive or operate a vehicle that carries more than 8 passengers, or exceeds gross vehicle weight rating (GVWR), or transports hazardous materials. This app contains questions from the actual CDL exam held in 2017, 2018, 2019, 2020, and 2021. (1) Class A CDL: Drivers with Class A CDL are