Vermont CDL — General Knowledge practice
Vermont 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
11 questions · pass with 9 correct. You get instant feedback and an explanation after every answer.
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11 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. Which of these is NOT part of the manual's guidance on speed in roadway work zones?
Correct answer: Return to highway speed whenever no workers are in sight
Posted limits apply at all times in a work zone, speed should come down for adverse weather or road conditions, and it should drop again when a worker is near the roadway.
Source: Vermont Commercial Driver's Manual — Section 2.6.7, Roadway Work Zones
2. Besides taking longer to stop, what else does the manual say a slippery road makes harder?
Correct answer: Turning without skidding
On a slippery road stopping takes longer and turning without a skid becomes harder, which is why such surfaces call for lower speeds.
Source: Vermont Commercial Driver's Manual — Section 2.6.2, Matching Speed to the Road Surface
3. Which of these is NOT among the manual's points about driving faster than the traffic around you?
Correct answer: It lowers your crash risk by getting you clear of other vehicles
Going faster than other traffic means constant passing, which raises the chance of a crash and is more tiring, and it does not save much time.
Source: Vermont Commercial Driver's Manual — Section 2.6.5, Speed and Traffic Flow
4. Which set of speed adjustments for slippery surfaces matches the manual?
Correct answer: Wet road: by about one-third; packed snow: by half or more; ice: to a crawl
On a wet road the manual says to reduce speed by about one-third. On packed snow, cut it by half or more. On ice, creep along and get off the road as soon as that can be done safely.
Source: Vermont Commercial Driver's Manual — Section 2.6.2, Matching Speed to the Road Surface
5. What does the manual say overloading does to a truck's stopping?
Correct answer: Stopping takes longer, and overworked brakes can fail
Overloading harms steering, braking and speed control. Stopping distance grows, and brakes that are forced to work too hard can fail.
Source: Vermont Commercial Driver's Manual — Section 3.2.2, Legal Weight Limits
6. At night, what must your speed allow in relation to your headlights?
Correct answer: Stopping within the distance your headlights let you see
Stopping distance has to stay within sight distance, which means driving slowly enough to stop inside the range your headlights light up.
Source: Vermont Commercial Driver's Manual — Section 2.11.4, Vehicle Factors
7. Which of these is NOT in the manual's advice on taking curves?
Correct answer: Brake firmly at the midpoint of the curve to settle the load
Braking while in a curve is risky because the wheels lock more easily and a skid can follow. Speed should be down before the curve, never above the posted limit, with a gear that allows slight acceleration.
Source: Vermont Commercial Driver's Manual — Section 2.6.3, Speed and Curves
8. By the manual's following-distance rule, which needs more seconds of space: a 20-foot truck at 50 mph or a 30-foot truck at 30 mph?
Correct answer: Neither; each needs 3 seconds
The 20-foot truck needs two seconds for its length plus one for being above 40 mph. The 30-foot truck needs three seconds for its length and no extra second below 40 mph.
Source: Vermont Commercial Driver's Manual — Section 2.7.1, Space Ahead
9. Which of these figures for stopping from 55 mph in ideal conditions does NOT match the manual?
Correct answer: Total stopping distance: about 300 feet
Perception distance (142 feet), reaction distance (61 feet) and braking distance (about 216 feet) add up to a minimum total stopping distance of 419 feet.
Source: Vermont Commercial Driver's Manual — Section 2.6.1, Stopping Distance
10. Which of these statements about speed and headlights at night is NOT in the manual?
Correct answer: Lighter night traffic means you can drive faster than by day
Low beams show about 250 feet and high beams about 350 to 500 feet, so the manual tells you to slow down on low beams. It never suggests that light traffic justifies more speed.
Source: Vermont Commercial Driver's Manual — Section 2.11.4, Vehicle Factors
11. You are going 50 mph and count five seconds between your vehicle and the one ahead. By the manual's following-distance rule, what is the longest vehicle for which five seconds is enough?
Correct answer: 40 feet
The rule allows a second per 10 feet of vehicle length, plus one more second above 40 mph. Five seconds at 50 mph therefore covers four seconds' worth of length, or 40 feet.
Source: Vermont Commercial Driver's Manual — Section 2.7.1, Space Ahead
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