Arizona CDL Combination Vehicles case studies
Arizona CDL Combination Vehicles · Put your knowledge to work in context.
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 test probes whether you can couple and uncouple safely, inspect a rig properly, control a long vehicle in turns and stops, manage space and speed, and respond correctly to skids, jackknifing, and brake failures. It also covers cargo securement, weight distribution and axle limits, railroad crossings, and hazardous conditions. The Arizona CDL Combination Vehicles case studies are 5 cases and about 4,230 words.
1Pre-Trip Air Loss on a Loaded Tractor-Trailer
You are about to leave a Phoenix yard at 6:00 a.m. with a 3-axle tractor and a 2-axle semi-trailer.
909 words, about 5 min2Off-Tracking on a Tight Right Turn With a 53-Foot Trailer
You drive a 3-axle tractor pulling a 53-foot trailer with the trailer axles slid all the way to the rear (California-legal 40-foot kingpin-to-axle setting). You are turning right from a two-lane street onto a narrower two-lane street in an older downtown.
858 words, about 4 min3Descending a 6% Grade With a Full Load and Warm Brakes
You are descending a 6% grade that runs 5 miles, posted 55 mph for cars and 35 mph for trucks over 26,000 lb. Your combination weighs 78,000 lb GCW.
844 words, about 4 min4Jackknife Risk During a Hard Brake on Wet Pavement
You are driving a bobtail-free 5-axle combination, empty trailer, at 55 mph on a wet two-lane highway at night. The trailer is empty, so the drive axles carry little weight.
763 words, about 4 min5Overweight and Poorly Secured Load After a Mid-Route Scale
You pick up a sealed flatbed load of steel plate at a yard. The shipper's paperwork says 42,000 lb of cargo.
856 words, about 4 min