Arizona CDL Combination Vehicles study guide
Arizona CDL Combination Vehicles · Work through your exam, one topic at a time.
The Arizona CDL Combination Vehicles knowledge test is the written endorsement exam a driver must pass to operate a tractor-trailer, doubles, triples, or other articulated vehicle. It is aimed at applicants pursuing a Class A commercial license or adding combination-vehicle authority, and it assumes you already understand basic CDL rules, vehicle inspection, and air brakes. The Arizona CDL Combination Vehicles study guide has 6 sections and about 1,745 words.
01Vehicle Inspection and Coupling/Uncoupling
A combination vehicle fails at the weakest link, and the weakest link is usually a coupling or a connection. Before every trip, and after any long stop, you must inspect the tractor, the trailer, and every point where they meet.
318 words, about 2 min02Driving Combination Vehicles: Turning, Braking, Speed, and Space
A combination vehicle is longer, heavier, and less maneuverable than a single unit. It has a larger turning radius, and the rear wheels of the trailer track inside the path of the tractor's front wheels.
308 words, about 2 min03Air Brakes and Brake Systems for Combinations
A combination vehicle uses a tractor protection valve, relay valves, and a dual air system. The compressor builds pressure, and the governor cuts it off at a set maximum.
291 words, about 1 min04Skid Control, Jackknifing, and Emergency Maneuvers
A drive-wheel skid happens when the rear tires lose traction, often from too much throttle or braking. A steer-wheel skid happens when the front tires lose traction, and steering control is lost.
275 words, about 1 min05Cargo Securement, Weight Distribution, and Load Limits
Cargo must be secured so it cannot shift, fall, or spill. Use tiedowns, straps, chains, and blocking.
254 words, about 1 min06Safety Regulations, Railroad Crossings, and Hazardous Conditions
Commercial drivers must follow hours-of-service rules, inspection requirements, and recordkeeping rules. Know that a driver must inspect the vehicle before and after trips, and must report defects.
299 words, about 1 min