North Dakota CDL — General Knowledge practice
North Dakota CDL — General Knowledge: Speed & Space Management practice test
Choosing a safe speed, keeping a space cushion, adjusting for weather and traffic, and understanding stopping distance.
Content reviewed against official driver handbooks · August 12, 2026
14 questions · pass with 11 correct. You get instant feedback and an explanation after every answer.
Choose your level
Up to 20 questions on this topic, with feedback after every answer.
Study questions with answers
12 sample Speed & Space Management questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
Show all 12 questions with answers
1. How does ice that has started to melt compare with ice that is not wet?
Correct answer: Wet ice is much more slippery
Slight melting puts a film of water on the ice, which cuts traction even further. The winter driving section adds that roads grow more slippery as the temperature climbs to the melting point.
Source: North Dakota Commercial Driver License Manual — Section 2.6.2, Matching Speed to the Road Surface
2. Why are freeway exits that go downhill and curve at the same time especially dangerous for commercial vehicles?
Correct answer: The downgrade makes slowing difficult, and braking while turning is risky
On such an exit gravity keeps pushing your speed up just when you need to turn, so be going slowly enough before you reach the curved part of the ramp.
Source: North Dakota Commercial Driver License Manual — Section 2.8.2, Hazardous Roads
3. When is the clearance under your vehicle likely to be smallest, and where does the manual say that often causes trouble?
Correct answer: When it is heavily loaded; on dirt roads and in unpaved yards
A full load pushes the vehicle down on its suspension and shrinks ground clearance, and rough unpaved surfaces are where it is most likely to get hung up.
Source: North Dakota Commercial Driver License Manual — Section 2.7.5, Space Below
4. What happens on a downgrade when some of your brakes are out of adjustment?
Correct answer: They stop doing their share, so the other brakes can overheat and fade
Every brake has to carry part of the load. When poorly adjusted brakes drop out, the rest take on extra work, heat up, and may leave too little braking to control the vehicle.
Source: North Dakota Commercial Driver License Manual — Section 2.16.3, Brake Fading or Failure
5. What does the manual warn about your speed through long sections of road construction?
Correct answer: Watch the speedometer so your speed does not creep up
Speeding traffic is the leading cause of injury and death in work zones, and speed tends to drift upward over a long stretch unless you keep checking it.
Source: North Dakota Commercial Driver License Manual — Section 2.6.7, Roadway Work Zones
6. In very hot weather, why watch for spots where tar has 'bled' to the surface of the pavement?
Correct answer: Those spots are very slippery
Heat draws tar up through the pavement, and the patches where it rises offer little traction.
Source: North Dakota Commercial Driver License Manual — Section 2.14.2, Driving
7. Why does the manual call braking in a curve dangerous?
Correct answer: The wheels lock more easily, which can cause a skid
Get your speed down before the curve begins. Once in it, braking makes wheel lockup and skidding more likely, so the manual advises a gear that allows slight acceleration instead.
Source: North Dakota Commercial Driver License Manual — Section 2.6.3, Speed and Curves
8. How does the manual suggest finding out which speeds are safe on the long, steep grades along your route?
Correct answer: Talk to other drivers who know those grades
Plan ahead for any long, steep grades on your route, and when possible ask drivers who have run them what speeds are safe.
Source: North Dakota Commercial Driver License Manual — Section 2.16, Mountain Driving
9. When is a high center of gravity most dangerous?
Correct answer: In curves, or when a hazard forces you to swerve
Cargo piled high or heavy items loaded on top raise the center of gravity, making a tip-over more likely in a curve or a sudden swerve, so the manual says to keep the load as low as you can.
Source: North Dakota Commercial Driver License Manual — Section 3.2.3, Don't Be Top-Heavy
10. The manual names a speed at which your stopping distance is longer than a football field. Which speed?
Correct answer: 60 mph
Tripling speed from 20 to 60 mph makes impact and braking distance nine times greater, and at 60 mph the total distance needed to stop exceeds a football field's length.
Source: North Dakota Commercial Driver License Manual — Section 2.6.1, Stopping Distance
11. You are following a vehicle much smaller than your truck. What should you keep in mind?
Correct answer: It is likely able to stop in less distance than you
A lighter vehicle generally stops in less distance, so following it too closely invites a rear-end crash. The manual notes the vehicle trucks and buses hit most often is the one in front.
Source: North Dakota Commercial Driver License Manual — Section 2.7.1, Space Ahead
12. Why does the manual warn about shaded parts of the road in cold weather?
Correct answer: Ice lingers there well after sunlit stretches have thawed
Sunlight melts ice on open pavement first, so shaded stretches can still be slick when the rest of the road looks clear.
Source: North Dakota Commercial Driver License Manual — Section 2.6.2, Matching Speed to the Road Surface
More CDL — General Knowledge topics
Practice Speed & Space Management in another state
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