North Dakota CDL — General Knowledge practice
North Dakota CDL — General Knowledge: Traffic Laws practice test
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
Content reviewed against official driver handbooks · August 12, 2026
16 questions · pass with 13 correct. You get instant feedback and an explanation after every answer.
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12 sample Traffic Laws questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. How does North Dakota limit the weight on a steering axle?
Correct answer: To 20,000 pounds or the manufacturer's axle rating, whichever is lower
Steering axle weight may not go above 20,000 pounds or the axle rating the manufacturer set, taking the lower figure. The 550-pounds-per-inch wheel load rule is not applied to steering axle tires.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Weight
2. What is North Dakota's limit on trailer length?
Correct answer: 53 feet
The length rules cap a trailer at 53 feet. The overall length of a combination is limited separately.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Length
3. In general, what total length may a three- or four-unit combination not exceed in North Dakota, load included?
Correct answer: 75 feet
A combination of three or four units is generally held to 75 feet overall with its load. Only on highways the Department of Transportation director designates may combinations run as long as 110 feet.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Length
4. A carrier has no overweight permit. What is the most gross weight it may run on the interstate system in North Dakota?
Correct answer: 80,000 pounds
A carrier lacking a permit is held to 80,000 pounds on the interstate system. The higher 105,500-pound figure belongs to state highways.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Weight
5. In general, what is the greatest total outside width North Dakota allows for a vehicle?
Correct answer: 8 feet 6 inches
Barring a special permit, a vehicle's overall outside width is capped at eight feet, six inches.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Width
6. Counting the load, how long may a single unit vehicle be in North Dakota if it has two or more axles?
Correct answer: 50 feet
A single unit vehicle that has two or more axles is limited to 50 feet, load included.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Length
7. For North Dakota's weight limits, when are two axles treated as one axle?
Correct answer: When they are 40 inches apart or less
Axles spaced 40 inches apart or closer count as a single axle. Axles more than 40 inches but under eight feet apart are tandem axles.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Weight
8. Unless a road is posted for less, what is the maximum gross weight on North Dakota's state highways?
Correct answer: 105,500 pounds
State highways allow up to 105,500 pounds gross weight unless a lower limit is posted. The interstate system is limited to 80,000 pounds without a permit.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Weight
9. What is the heaviest load a single axle may carry under North Dakota's weight rules?
Correct answer: 20,000 pounds
A single axle may carry up to 20,000 pounds, or 10,000 pounds as a wheel load.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Weight
10. A North Dakota driver never crosses the state line, but part of the load on the truck began its trip in another state. How does the manual classify this driver?
Correct answer: As an interstate driver
The manual's note says a driver still counts as interstate whenever some part of the load started, or will end up, outside North Dakota, even without crossing a state line personally.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Medical Certificate Requirements
11. North Dakota lets resident farmers move implements of husbandry up to 15 feet 6 inches high. Which set of conditions applies to such a move?
Correct answer: Inside a 60-mile radius, during the hours from sunrise to sunset, and off interstate highways
Resident farmers, ranchers, implement dealers, and farm machinery manufacturers may exceed the normal 14-foot limit with such implements only inside a 60-mile radius, in daylight, and off the interstate.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Height
12. Who may grant special permits for overlength, overwidth, overheight, or overweight vehicles in North Dakota?
Correct answer: The North Dakota State Highway Patrol
Special size and weight permits are handled one case at a time by the State Highway Patrol.
Source: North Dakota Commercial Driver License Manual — North Dakota Information, Width, Height, Length, and Weight Requirements
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Every North Dakota question is written from the official North Dakota driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free