Nebraska CDL — General Knowledge practice
Nebraska CDL — General Knowledge: Safe Driving Practices practice test
Following distance, scanning, blind spots, using your lights, and the habits that prevent crashes and keep you in control.
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 Safe Driving Practices 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. For which transmissions does the manual say double clutching is NOT required?
Correct answer: Synchronized manual transmissions
Unsynchronized manual transmissions in most heavy vehicles call for double clutching, but a synchronized manual transmission does not.
Source: Nebraska Commercial Driver's License Manual — Section 2.3.1, Manual Transmissions
2. During an inspection you find a rim that has been repaired by welding. How does the manual regard it?
Correct answer: As unsafe
The manual's list of wheel and rim problems says wheels or rims with welding repairs are not safe.
Source: Nebraska Commercial Driver's License Manual — Section 2.1.3, What to Look For
3. When stopping a vehicle that has a manual transmission, when should you push the clutch in?
Correct answer: Once engine speed has dropped nearly to idle
The manual says to brake gradually and, with a manual transmission, to push the clutch in once the engine is near idle.
Source: Nebraska Commercial Driver's License Manual — Section 2.2.3, Stopping
4. You lean far out of your seat to grab your phone, intending to use its hands-free feature. Are you in compliance with the mobile phone rule?
Correct answer: No, unsafely reaching for the phone is noncompliant even if you mean to use it hands-free
The manual says a driver who reaches unsafely for a phone is out of compliance, even when the plan is to use the hands-free function. The phone should be within close reach.
Source: Nebraska Commercial Driver's License Manual — Section 2.9.6, Don't Drive Distracted
5. Why does hanging meat in a refrigerated truck call for particular caution?
Correct answer: The load swings easily and sits high, raising the center of gravity
Suspended meat is unstable and carries its weight high, so the manual says to go slowly on sharp curves such as ramps.
Source: Nebraska Commercial Driver's License Manual — Section 3.4.2, Hanging Meat
6. How do hands-free devices compare with hand-held phones as a source of distraction?
Correct answer: They are no less likely to distract you
The manual notes that attention is pulled away from driving with either kind of device, so hands-free is no less likely to distract you.
Source: Nebraska Commercial Driver's License Manual — Section 2.9.4, Cell/Mobile Phones
7. Why does the manual tell you to hold the steering wheel firmly with your hands on opposite sides of it?
Correct answer: Hitting a curb or pothole could pull the wheel out of your hands
Without a firm two-handed hold, striking a curb or a pothole can jerk the wheel away from you.
Source: Nebraska Commercial Driver's License Manual — Section 2.2.2, Steering
8. Before starting out, why does the manual tell you to secure loose articles in the cab?
Correct answer: They could interfere with the controls or strike you during a crash
Loose items can get in the way of operating the controls or become projectiles in a collision.
Source: Nebraska Commercial Driver's License Manual — Section 2.1.5, Seven-step Inspection Method
9. Many vehicles get extra gears from a multi-speed rear axle or an auxiliary transmission. How does the manual say these are usually controlled?
Correct answer: With a knob or switch mounted on the main gearshift lever
These units add extra gears and are normally worked from a selector knob or switch located on the main transmission's shift lever.
Source: Nebraska Commercial Driver's License Manual — Section 2.3.2, Multi-speed Rear Axles and Auxiliary Transmissions
10. By the manual's figures, a text pulls a driver's eyes off the road for 4.6 seconds on average. How far does the vehicle travel in that time at 55 mph?
Correct answer: 371 feet
At 55 mph, 4.6 seconds covers 371 feet, about the length of a football field. The 306-foot figure belongs to dialing, which averages 3.8 seconds.
Source: Nebraska Commercial Driver's License Manual — Section 2.9.5, Texting
11. Ice has sealed your radiator shutters, or the winterfront is shut too tightly. What can result?
Correct answer: The engine may overheat and stop
The manual says to remove ice from the shutters and not to close the winterfront too far, because either problem can make the engine overheat and stop.
Source: Nebraska Commercial Driver's License Manual — Section 2.13.1, Vehicle Checks
12. An exhaust leak lets carbon monoxide into a cab with the windows rolled up. What does the manual say the gas will do?
Correct answer: Make you sleepy, and in large enough amounts kill you
Loose exhaust connections can let carbon monoxide into the vehicle. The manual warns that it causes sleepiness and can be fatal in sufficient quantity.
Source: Nebraska Commercial Driver's License Manual — Section 2.13.1, Vehicle Checks
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