Colorado CDL Combination Vehicles case studies
Colorado CDL Combination Vehicles · Put your knowledge to work in context.
The Colorado 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 under a Colorado Class A commercial license. It is aimed at new CDL applicants, drivers upgrading from a Class B or Class C license, and out-of-state drivers transferring a combination-vehicle endorsement. The Colorado CDL Combination Vehicles case studies are 5 cases and about 2,445 words.
1Coupling a Loaded Van on a Slight Slope
At a Denver-area shipper, you are coupling a 2018 three-axle tractor to a loaded 53-foot dry van. The trailer is parked on a paved lot with a 2 percent slope toward the rear; the landing gear is down and the wheels are chocked.
594 words, about 3 min2Brake Fade on a Six Percent Mountain Grade
You are driving a 5-axle tractor-semitrailer grossing 78,500 lb eastbound on I-70 descending from the Eisenhower Tunnel toward Georgetown. The grade is 6 percent for about 2 miles.
467 words, about 2 min3ABS Lamps On Before a Wet Interstate Run
You are assigned a 2021 three-axle tractor and a 2019 53-foot trailer. After engine start, the tractor ABS lamp stays on after the bulb check, and the trailer ABS lamp also stays on.
476 words, about 2 min4Scale Ticket, Steel Coils, and a Sliding Fifth Wheel
At a Colorado port of entry, your 5-axle tractor-semitrailer with a 48-foot flatbed scales as follows: steer axle 12,400 lb (limit 12,000), drive axles 33,200 lb (limit 34,000), trailer tandems 33,000 lb (limit 34,000), gross 78,600 lb (limit 80,000). The load is six steel coils totaling 42,000 lb, arranged in a single row.
457 words, about 2 min5Drive-Wheel Skid on a Snowy Mountain Pass
You are driving a 5-axle tractor-semitrailer loaded to 74,000 lb on US-40 near Rabbit Ears Pass. Light snow is falling, and the road is packed snow over ice.
451 words, about 2 min