Massachusetts CDL Combination case studies
Massachusetts CDL Combination · Put your knowledge to work in context.
The Massachusetts CDL Combination Vehicles knowledge test is the written exam a driver must pass to add the combination vehicles classification to a Massachusetts commercial learner's permit or CDL. It is aimed at drivers who will operate a tractor-trailer, a truck pulling a heavy trailer, or a double/trailer setup - in other words, anyone whose vehicle's power unit and towed unit are separate and articulated. The Massachusetts CDL Combination case studies are 5 cases and about 2,870 words.
1Air Leak Test on a Loaded Tractor-Trailer Before a Worcester Run
At a Worcester yard, you are assigned a 2021 three-axle tractor with a 53-foot van trailer loaded to 44,000 lb. Before leaving, you perform the combination air-brake checks with the engine off and the system charged to 100 psi.
638 words, about 3 min2Fifth Wheel Coupling With a High-Hook Warning at a Springfield Rail Yard
At a Springfield rail yard, you are coupling to a loaded 48-foot flatbed carrying steel coil. The trailer kingpin is set at 48 inches above the ground.
568 words, about 3 min3Right Turn With a 53-Foot Trailer on a Narrow Somerville Street
You are driving a 53-foot trailer westbound on a two-lane one-way street in Somerville, approaching a right turn onto a two-way cross street. Your trailer's rear wheels track about 8 feet inside the tractor's path.
591 words, about 3 min4Brake Fade on a Berkshire Downgrade With a Heavy Paper Load
You are descending a 6% grade on a two-lane state highway in the Berkshires with a 48-foot trailer loaded with 46,000 lb of paper rolls. At the top you are in 7th gear at 45 mph.
555 words, about 3 min5Air Leak and Soft Pedal on I-90 Near Palmer
You are westbound on I-90 near Palmer at 60 mph with a 40,000 lb load. A four-wheeler cuts across your lane and brakes hard.
518 words, about 3 min