Designed for those interested in general commercial driver’s license (CDL) knowledge, CDL General Knowledge (three hours) training contains safe driving information that all commercial drivers should know. It is broken into three modules: Vehicle control, shifting gears, seeing the road, communicating, speed control and space management; night driving, driving in cold and hot weather, mountain driving and railroad crossings; and seeing hazards, driving and road emergencies, staying alert and fit to drive and transporting hazardous materials.