Traffic Signs & Signals — Tennessee
Tennessee CDL practice test: 468 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: 3 questions.
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 / Metric | Value |
|---|---|
| Topic | Traffic Signs & Signals |
| License test | Tennessee CDL permit (CLP) knowledge tests |
| Topic questions | 3 (1% of 468 total) |
| Review status | This 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
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Questions (3)
1. Which of the following is not a warning sign of fatigue?
- Difficulty focusing
- Staying within your lane ✓
- Rubbing your eyes
Answer: B. Staying within your lane
2. What is the symbol for a marine pollutant?
- The image of a waves in a yellow triangle with an X through through the waves
- The image of a fish in a white triangle with an X through through the fish ✓
- A light blue square with a dark blue X through the square
- The image of a bird in a red octagon
Answer: B. The image of a fish in a white triangle with an X through through the fish
The marine pollutant symbol is a white triangle containing a fish with an X drawn through the fish. The handbook says any bulk package of a marine pollutant must show the Marine Pollutant marking: a white triangle with a fish and an X through the fish. It also says this is a marking, not a placard, and that it must appear on the outside of the vehicle as well as on the package. So the symbol to look for is the fish inside the white triangle with the X crossing the fish.
3. What does the trailer air supply control look like?
- It is a square blue knob.
- It is a triangular yellow knob.
- It is an eight-sided red knob. ✓
- 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.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook