Traffic Signs & Signals — Wisconsin

Wisconsin CDL practice test: 443 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: 4 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 testWisconsin CDL permit (CLP) knowledge tests
Topic questions4 (1% of 443 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 (4)

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. 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
3. Which of the following is not a warning sign of fatigue?
  1. Difficulty focusing
  2. Staying within your lane ✓
  3. Rubbing your eyes

Answer: B. Staying within your lane

Official handbook: Official handbook
4. When making a stop to pick up students, a driver should ensure all surrounding traffic has stopped before:
  1. Opening the door and signaling for the students to approach. ✓
  2. Turning on the alternating red lights.
  3. Pulling over to the side of the road.

Answer: A. Opening the door and signaling for the students to approach.

The driver should make sure all surrounding traffic has stopped before opening the door and signaling the students to approach. The handbook tells school bus drivers to make a final check that all traffic has stopped before completely opening the door and signaling students to approach. That places the traffic check right before the door opens and before students are given the signal to come toward the bus. It connects directly to the action of letting students approach, so the driver does not invite them forward until surrounding traffic is stopped.
Official handbook: Texas Commercial Driver License Handbook (DL-7C), Section 10 – School Buses, p. 138
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Last checked: 2026-10-17 · Verified from official source

Updated: · Based on the official driver handbook