General Knowledge: Safe Operation and Inspection Basics
What the General Knowledge test covers
This domain tests baseline safe operation and inspection for every ND CDL vehicle. Expect questions on pre-trip inspection, basic control, shifting, backing, speed and space management, hazard recognition, emergency maneuvers, railroad crossings, and cargo securement basics.
Core rules
- Pre-trip inspection is a systematic check, not a light test: tires, brakes, lights, steering, coupling, cargo securement, and emergency equipment.
- Look 12–15 seconds ahead in town and farther on open roads. At highway speed, scan for stale green lights, brake lights, and shoulder hazards.
- Use the length-based following rule: one second per 10 feet of vehicle length below 40 mph, plus one extra second above 40 mph.
- Railroad crossings: slow down, look both ways, listen, and do not stop on the tracks. If your vehicle cannot clear the crossing, stop before it.
Worked example
A 60-foot tractor-trailer is traveling 55 mph. The base gap is 60 ÷ 10 = 6 seconds; because speed is above 40 mph, add 1 second, for 7 seconds. At 55 mph the vehicle covers about 81 feet per second, so 7 seconds is roughly 565 feet. If sight distance is shorter, reduce speed. The rule works because longer and faster vehicles need more time to perceive, react, and stop.
Traps
- Inspecting lights only and missing brake adjustment, tire damage, or unsecured cargo.
- Following a car at a 4-second gap at highway speed in a long combination.
- Treating a green light as a guarantee; stale greens hide cross traffic.
- Rolling a railroad crossing without enough room to clear it.
- Assuming a light load shortens stopping distance; brake and traction limits still apply.