Nevada CDL — General Knowledge practice
Nevada 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.
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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.
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1. You are driving through a long stretch of road construction. What does the manual warn about your speed?
Correct answer: Watch your speedometer so your speed doesn't creep up
Obey the posted limits all the way through a work zone and keep an eye on the speedometer so your speed doesn't drift upward in long construction areas.
Source: Nevada Commercial Driver's License Manual — Section 2.6.7, Roadway Work Zones
2. When liquid surges in a partly filled tank on an icy road, what can happen as you come to a stop?
Correct answer: The wave can shove the stopped truck forward into an intersection
Liquid sloshing back and forth pushes the truck in the direction the wave travels. On ice, that wave can push a stopped truck out into an intersection.
Source: Nevada Commercial Driver's License Manual — Section 8.2.2, Danger of Surge
3. On a banked curve, your bus leans toward the outside. What does that tell you?
Correct answer: You are going too fast
Banked curves each have a safe 'design speed.' A bus that leans toward the outside of the curve is going faster than that.
Source: Nevada Commercial Driver's License Manual — Section 4.3.4, Speed on Curves
4. What can happen if you force an automatic transmission to downshift at high speed on a downgrade?
Correct answer: You can damage the transmission and lose all engine braking
Choose the low gear before starting down. Forcing an automatic into a lower gear at high speed can damage the transmission and leave you without any engine braking.
Source: Nevada Commercial Driver's License Manual — Section 2.16.2, Select the Right Gear before Starting Down the Grade
5. Your air pressure drops and the spring brakes come on while your truck is heavily loaded. Why is that a problem?
Correct answer: Spring brakes don't work on all axles, so stopping takes a long distance
A heavily loaded vehicle needs a long distance to stop on spring brakes because they don't act on every axle, and light vehicles or slick roads risk a skid. Stop while you still have air for the foot brakes.
Source: Nevada Commercial Driver's License Manual — Section 5.4.7, Low Air Pressure
6. With air brakes, about how much distance does brake lag add at 55 mph on dry pavement?
Correct answer: About 32 feet
Air needs a moment to travel through the lines, adding brake lag. At 55 mph on dry pavement it adds about 32 feet, which pushes total stopping distance past 450 feet.
Source: Nevada Commercial Driver's License Manual — Section 5.4.4, Stopping Distance
7. How does stopping a bobtail tractor (no semitrailer) compare with stopping a tractor-semitrailer carrying a full maximum gross load?
Correct answer: The bobtail can take longer to stop and be hard to stop smoothly
Tests show bobtail tractors can be very hard to stop smoothly and need more distance than a tractor-semitrailer at maximum gross weight.
Source: Nevada Commercial Driver's License Manual — Section 6.1.3, Brake Early
8. How long does it take air to reach the brakes after you press the pedal on an air brake system?
Correct answer: One half second or more
Hydraulic brakes act almost at once, but with air brakes it takes at least half a second for air to move through the lines. That delay is brake lag.
Source: Nevada Commercial Driver's License Manual — Section 5.4.4, Stopping Distance
9. Why do the brakes on a heavier vehicle have a harder job?
Correct answer: They must do more work to stop it and absorb more heat
The heavier the vehicle, the more work its brakes do and the more heat they take in, though heavy-vehicle brakes, tires, and suspension are built to work best fully loaded.
Source: Nevada Commercial Driver's License Manual — Section 2.6.1, Stopping Distance
10. In a dual air brake system, one half is very low on air. What happens to stopping?
Correct answer: It takes longer to stop because either the front or rear brakes aren't fully working
If one system is very low, the front or the rear brakes won't work fully, so stopping takes more distance. Get the vehicle safely stopped and have the system repaired.
Source: Nevada Commercial Driver's License Manual — Section 5.2, Dual Air Brake
11. A curve speed that works for a straight truck or a rig with one trailer may be what for doubles or triples?
Correct answer: Too fast
To keep trailers upright, steer gently and go slowly around corners, ramps, and curves. A speed that works for a straight truck or single-trailer combination may be too fast for doubles or triples.
Source: Nevada Commercial Driver's License Manual — Section 7.1.1, Prevent Trailer from Rolling Over
12. Which kind of freeway exit does the manual call especially dangerous for commercial vehicles?
Correct answer: One that goes downhill and turns at the same time
Exits that drop downhill while turning are especially risky: the grade makes slowing hard, and braking while turning is dangerous. Get slow enough before the curved part of the ramp.
Source: Nevada Commercial Driver's License Manual — Section 2.8.2, Hazardous Roads
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