DC CDL General Knowledge case studies
DC CDL General Knowledge · Put your knowledge to work in context.
The DC CDL General Knowledge test is the core written knowledge exam that anyone pursuing a District of Columbia commercial driver's license must pass before moving on to endorsement tests and the skills (road) test. It is designed for drivers who intend to operate Class A, Class B, or Class C commercial vehicles - tractor-trailers, straight trucks, tankers, and certain passenger or hazmat vehicles - in and around Washington, DC. The DC CDL General Knowledge case studies are 5 cases and about 2,666 words.
1Wet-Curve Steer Axle Skid With Trailer Swing
You drive a three-axle tractor pulling a loaded 53-foot van for a regional grocery distributor. The gross weight is 72,000 lb, and the trailer holds paper rolls loaded tight to the nose.
590 words, about 3 min2Steer Axle Overload and Leaning Pallet Load
You drive a five-axle tractor-semitrailer hauling bottled water from a DC warehouse to Arlington. At the scale, the steer axle weighs 12,400 lb, the drive tandem 20,200 lb, the trailer tandem 33,800 lb, and the gross 66,400 lb.
572 words, about 3 min3Fatigue, Sedating Medication, and a Late-Fee Deadline
You are a solo driver for a bakery in a 26-foot box truck. You started at 2:00 a.m., drove 8 hours 45 minutes, and took a 30-minute break at 6:00 a.m.
484 words, about 2 min4School Bus at a Passive Two-Track Crossing
You drive a 40-foot Type C school bus with 38 middle-school students on a two-lane road in Anacostia. At 2:45 p.m., you approach a passive railroad crossing with a stop sign, no gates, and flashing lights that begin to activate when your front bumper is 75 feet from the nearest rail.
524 words, about 3 min5Brake Fade on a 6% Grade With a Tanker
You drive a 78,000-lb five-axle tanker down a 6% grade on I-68 near Cumberland, Maryland. The posted truck speed is 45 mph, and you are at 50 mph in 8th gear at 1,700 rpm.
496 words, about 2 min