CDL Combination Vehicles Practice Test 2026
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Source: CDL Manual — Combination VehiclesLast verified: Unknown · Not yet verified
🎯 Practice by Topic
Driving Combination Vehicles Safely
Driving combination vehicles safely: rollover risks, steering gently to avoid the crack-the-whip effect, braking early, railroad-highway crossings, preventing trailer skids, and turning wide because of off-tracking.
Coupling and Uncoupling
Step-by-step procedure to safely couple and uncouple a tractor and semi-trailer (AAMVA §6.4): inspect the fifth wheel, line up, chock wheels, back under, test the coupling, visually check the locking jaws around the kingpin, connect lines, raise the landing gear, and remove chocks.
Inspecting a Combination Vehicle
The additional checks for combination vehicles beyond the general pre-trip: the coupling system (fifth wheel, kingpin, locking jaws), sliding fifth wheel, landing gear, air and electrical lines, and the combination-vehicle air-brake check (air to all trailers, tractor protection valve, trailer emergency and service brakes).
Air Lines & Electrical Connections
Combination-vehicle air-brake connections: the trailer hand valve, tractor protection valve, trailer air supply control (red knob), service and emergency air lines, glad hands and color-coding, trailer air tanks, shut-off valves, and the trailer electrical cord.
ABS on Combination Vehicles
Antilock braking systems on tractors, trailers and converter dollies: which units must have ABS, yellow malfunction lamps, how ABS helps you keep steering control without shortening stopping distance, braking normally, and mixed-ABS towing.