Traffic Signs & Signals — Utah

Utah CDL practice test: 477 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Traffic Signs & Signals: 5 questions. Updated

Regulatory, warning and guide signs, plus traffic light and pavement marking questions.

This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.

Topic / MetricValue
TopicTraffic Signs & Signals
License testUtah CDL permit (CLP) knowledge tests
Topic questions5 (1% of 477 total)
Review statusThis topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.

Official handbook

Not yet verified State CDL manual (based on the AAMVA model manual) link not yet collected

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Questions (5)

1. What does the trailer air supply control look like?
  1. It is a square blue knob.
  2. It is a triangular yellow knob.
  3. It is an eight-sided red knob. ✓
  4. It is a circular orange knob.

Answer: C. It is an eight-sided red knob.

The trailer air supply control on newer vehicles is a red eight-sided knob. The handbook describes the trailer air supply control in the cab, which operates the tractor protection valve. On newer vehicles it is a red knob with eight sides. You push it in to send air to the trailer and pull it out to cut the air off and apply the trailer emergency brakes. The same knob pops out on its own when air pressure falls to roughly 20 to 45 psi, closing the tractor protection valve. Older vehicles may instead have a lever rather than a knob.
Official handbook: Texas Commercial Driver License Handbook (DL-7C), Section 6 – Combination Vehicles, p. 95
2. When approaching a drawbridge controlled by a green traffic light:
  1. You must stop.
  2. You may proceed without stopping. ✓
  3. You must wait for the light to change from green to yellow.

Answer: B. You may proceed without stopping.

Official handbook: Official handbook
3. If you doubt that you have enough space to safely drive under a bridge or sign, you should:
  1. Drive faster.
  2. Drive more slowly. ✓
  3. Drive on the shoulder.

Answer: B. Drive more slowly.

You should drive more slowly when you are not sure you have enough space to drive under a bridge or sign. The handbook says that if you doubt you have safe space to pass under an object, you should go slowly. It also says that if you are not sure you can make it, take another route. It notes that low bridges and underpasses often have warning signs, but sometimes they do not. That makes doubt a reason to be cautious, not to try the clearance at higher speed.
Official handbook: Texas Commercial Driver License Handbook (DL-7C), Section 2 – Driving Safely, p. 45
4. If a traffic light has been green for a long time:
  1. It will probably stay green as you approach.
  2. It is likely broken.
  3. It is likely that the light will soon change to yellow. ✓
  4. It is likely the light will skip yellow and change from green to red.

Answer: C. It is likely that the light will soon change to yellow.

If a traffic light has been green for a long time, expect it to soon change to yellow. The handbook tells drivers to look far ahead and treat a long-lasting green as a sign that the light will probably change before they arrive. It says to start slowing down and be ready to stop. Since the change is expected as you approach, the best match is that yellow is likely coming soon. The manual does not say the light is broken or that it will skip yellow.
Official handbook: Texas Commercial Driver License Handbook (DL-7C), Section 2 – Driving Safely, p. 38
5. Which of the following is likely to result in the most student deaths per year?
  1. Students loading and unloading a school bus ✓
  2. Accidents involving drunk drivers
  3. Accidents involving negligence
  4. Accidents in which drivers ignore traffic signals or signs

Answer: A. Students loading and unloading a school bus

Official handbook: Official handbook
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Last checked: 2026-10-17 · Verified from official source

Updated: · Based on the official driver handbook