Delaware CDL — General Knowledge practice
Delaware 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. What does the manual name as the most frequent cause of trucks and buses running into the vehicle ahead?
Correct answer: Following too closely
Accident reports show the vehicle in front is the one trucks and buses hit most often, and the manual identifies following too closely as the usual cause.
Source: Delaware Commercial Driver's Manual — Section 2.7.1, Space Ahead
2. You are about to drive into a bank of fog. What does the manual tell you not to assume?
Correct answer: That the fog will thin out once you are in it
Fog is often unexpected and visibility can drop quickly. The manual says to be ready to reduce speed and not to count on the fog thinning after you enter.
Source: Delaware Commercial Driver's Manual — Section 2.12, Driving in Fog
3. Why do most drivers break the speed limit, according to the manual?
Correct answer: To save time
The manual says saving time is the main reason, and that anyone trying to outrun the flow of traffic will not save much. The added risk is not worth it.
Source: Delaware Commercial Driver's Manual — Section 2.6.5, Speed and Traffic Flow
4. Using the manual's downgrade braking technique, about how long should each brake application last?
Correct answer: About three seconds
In the proper low gear, you brake firmly enough to feel the vehicle clearly slow until you are about 5 mph under your safe speed, an application that should take roughly three seconds, then release.
Source: Delaware Commercial Driver's Manual — Section 2.16.4, Proper Braking Technique
5. For older trucks, what rule does the manual give for choosing a gear to go down a hill?
Correct answer: Use the same gear you would need to climb that hill
The older-truck rule is same gear down as up. Newer trucks have less friction and drag holding them back, so their drivers may need a lower gear going down than going up.
Source: Delaware Commercial Driver's Manual — Section 2.16.2, Select the Right Gear before Starting Down the Grade
6. According to the manual's section on managing space, what does having space around your vehicle give you when something goes wrong?
Correct answer: Time to think and take action
Space buys time. The manual says that when things go wrong, room around the vehicle gives you time to think and act, which is why space has to be managed.
Source: Delaware Commercial Driver's Manual — Section 2.7, Managing Space
7. At 55 mph in ideal conditions, which part of total stopping distance is the longest by the manual's figures?
Correct answer: Braking distance, about 216 feet
The manual gives about 142 feet for perception, 61 feet for reaction, and about 216 feet for braking on dry pavement with good brakes, for a minimum total of 419 feet.
Source: Delaware Commercial Driver's Manual — Section 2.6.1, Stopping Distance
8. How should you accelerate on a rain-slick or snowy road where traction is poor?
Correct answer: Very gradually, because too much power can spin the drive wheels
The manual says to accelerate very gradually in poor traction. Too much power may spin the drive wheels and cost you control; if they start to spin, come off the accelerator.
Source: Delaware Commercial Driver's Manual — Section 2.2.1, Accelerating
9. During the urban business portion of the road test, how should your speed compare with traffic and the posted limit?
Correct answer: Stay with the traffic flow, but never above the posted limit
In this part of the test you make regular traffic checks, hold a safe following distance, stay centered in the proper lane, and keep pace with traffic without exceeding the speed limit.
Source: Delaware Commercial Driver's Manual — Section 13.1.3, Urban Business
10. According to the manual, under what load condition are a heavy vehicle's brakes, tires, springs, and shock absorbers designed to work best?
Correct answer: With the vehicle fully loaded
A heavier vehicle makes the brakes work harder, yet these components are built to perform best at full load. An empty truck has less traction and needs more distance to stop.
Source: Delaware Commercial Driver's Manual — Section 2.6.1, Stopping Distance
11. On slippery winter roads, how does the manual tell you to take curves?
Correct answer: At slower speeds, without braking while in the curve
Under adjusting speed to conditions, the manual says to slow for curves and to keep off the brakes while in them, and to watch far enough ahead to hold a steady speed.
Source: Delaware Commercial Driver's Manual — Section 2.13.2, Driving
12. Even when livestock are bunched together in a trailer, why is special care still needed on curves?
Correct answer: The animals can lean, shifting the center of gravity and making a rollover more likely
Livestock can move around and cause unsafe handling. Even when kept bunched, they can lean in a curve, which moves the center of gravity and raises the rollover risk.
Source: Delaware Commercial Driver's Manual — Section 3.4.3, Livestock
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