This CDL practice test study guide contains general knowledge and safe driving information that all commercial drivers should know regardless of what class of vehicle they intend to operate. You must pass a test on this information to get a CDL license.Sections of this CDL Practice Test Study Guide InspectionVehicle ControlShifting GearsSeeingCommunicatingSpeed & Space ManagementNight DrivingDriving in FogWinter DrivingDriving in Hot WeatherRailroad CrossingsMountain DrivingSeeing HazardsEmergenciesSkid Control & RecoveryAccident ProceduresStaying AlertHazardous Materials Rules for all Commercial DriversInspecting CargoCargo Weight and BalanceSecuring CargoOther Cargo Needing CareGlossary of Weight TermsSample Test Sample Test AnswersPre-Trip Inspection Memory Aid