The Combination Vehicles test is required for a Class A CDL — driving a tractor-trailer. It focuses on the extra skills a coupled rig demands: hooking up safely, turning without clipping the curb, and keeping a long, heavy vehicle under control. Practice all 64 questions with explanations.
Start the Combination Vehicles practice test →Covers coupling and uncoupling step by step, the fifth wheel, kingpin and locking jaws, the landing gear and glad hands, off-tracking and turning wide, preventing rollovers and jackknifes, recovering from trailer skids, the trailer hand valve, and inspecting a combination vehicle.
Each question on CDL Prep Hub comes with a plain-English explanation, so you learn the "why" behind every answer. Aim for 80% or better — that's the passing mark in most states — then take the timed exam simulator to rehearse the real format. No account needed; your best scores save in your browser.
Start the Combination Vehicles practice test →Study material based on the official CDL manual. Not the official state exam — always review your state's CDL handbook before testing.