Mississippi CDL Combination case studies
Mississippi CDL Combination · Put your knowledge to work in context.
The Mississippi CDL Combination Vehicles Knowledge Test is a required written component for drivers seeking a Class A commercial driver's license (CDL) or certain Class B combinations in Mississippi. It assesses your knowledge of safe operation of tractor-trailers and other combination vehicles, including coupling and uncoupling, air brake systems, inspection procedures, turning and backing, rollover prevention, skid recovery, and special trailer types. The Mississippi CDL Combination case studies are 5 cases and about 2,526 words.
1Brake Fade and Falling Air Pressure on a Six-Mile Downgrade
You are driving a 2019 three-axle tractor pulling a tandem-axle van, loaded to a gross weight of 79,000 lb. At the top of a 6% downgrade posted for trucks, you shift the 10-speed transmission into 7th gear and start down at 45 mph.
576 words, about 3 min2Picking Up a Loaded Trailer with a False Fifth-Wheel Lock
You are picking up a loaded 53-foot van at a gravel yard. The trailer is parked nose-down on a slight slope, and its landing gear is sunk about 2 inches.
510 words, about 3 min3High-CoG Steel Load and an Overloaded Axle on a Loop Ramp
You are assigned a 48-foot flatbed loaded with three upright steel coils. The coils weigh 44,000 lb total and are chained at the front, middle, and rear of the deck.
504 words, about 3 min4Right Turn with a 53-Foot Trailer, a Blocked Curb Lane, and a Cyclist
You are driving a 53-foot van with a 102-inch beam through a downtown intersection in Jackson. You want to turn right onto a two-lane street.
479 words, about 2 min5Trailer Jackknife on Oil-Slick Pavement
You are driving a 5-axle tractor-semitrailer loaded to 78,000 lb on I-55. Light rain has just started after two dry weeks, and the pavement is slick with oil.
457 words, about 2 min