Ohio CDL Combination case studies
Ohio CDL Combination · Put your knowledge to work in context.
The Ohio CDL Combination knowledge test is the written endorsement exam a driver must pass before operating a combination vehicle - a tractor-trailer or other rig with a towed unit - under a Ohio commercial driver license. It is aimed at applicants who already hold or are pursuing a CDL and want the combination classification that most heavy freight, tanker, and long-haul jobs require. The Ohio CDL Combination case studies are 5 cases and about 2,891 words.
1Coupling a Low Trailer on a Crowned Gravel Yard
On a gravel yard with a slight crown, you are picking up a loaded 53-foot van that was dropped two days ago. The landing gear rests on a piece of plywood, but the trailer nose sits visibly lower than the tractor's fifth wheel; the kingpin plate measures about 44 inches off the ground.
628 words, about 3 min2Air Leak at the Trailer Emergency Line
During a pre-trip on a 2018 tractor and 53-foot trailer, you build system pressure to 120 psi with the engine off. With the brakes released, pressure falls from 120 to 114 psi in two minutes.
566 words, about 3 min3Right Turn Across a Bike Lane With a 53-Foot Trailer
You are driving a 53-foot trailer with the tandems set 8 feet forward of the rear. You approach a right turn from a two-lane road onto a two-lane road.
602 words, about 3 min4Brake Fade on a 6% Grade With a Heavy Load
You are descending a 6% grade that runs 2 miles, loaded to 78,000 pounds gross in a 53-foot van. The speed limit is 55 mph.
572 words, about 3 min5Scale Ticket and Trailer Tandem Slide Decision
At an Ohio weigh station, your 5-axle tractor-trailer scales: steer axle 11,800 lb, drive tandems 33,200 lb, trailer tandems 34,600 lb. The trailer tandem is set in the fourth hole from the rear.
523 words, about 3 min