Arizona CDL — General Knowledge practice
Arizona CDL — General Knowledge: Road Signs practice test
Learn the shapes, colors, and meanings of regulatory, warning, and guide signs — from stop and yield to construction and school-zone signs.
Content reviewed against official driver handbooks · August 12, 2026
12 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.
Study questions with answers
12 sample Road Signs questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
Show all 12 questions with answers
1. What does the round, black-on-yellow railroad sign placed ahead of a crossing tell you?
Correct answer: To reduce speed, watch and listen for an approaching train, and be prepared to stop
This advance warning sign alerts you to a coming railroad crossing so you slow, watch, and listen, and prepare to stop if a train is approaching.
Source: Arizona CDL Manual — Section 2: Driving Safely
2. In the hazard-class system, which class covers flammable liquids such as gasoline?
Correct answer: Class 3
Flammable liquids like gasoline and acetone fall in Class 3 of the hazardous-materials classification.
Source: Arizona CDL Manual — Section 2: Driving Safely
3. During the walk-around, what color should the reflectors and marker lights be at the front of the vehicle?
Correct answer: Amber
Clearance and marker lights and reflectors should show amber at the front of the vehicle and red at the rear, and they must be clean and working.
Source: Arizona CDL Manual — Section 2: Driving Safely
4. A hazardous-materials placard has what shape?
Correct answer: A square turned to stand on one point, forming a diamond
Placards are square signs set upright on a point so they read as diamonds, and a placarded vehicle carries four identical ones facing all directions.
Source: Arizona CDL Manual — Section 2: Driving Safely
5. Where is the ABS malfunction lamp located on a trailer?
Correct answer: On the left side, at the front or rear corner
A trailer's yellow ABS malfunction lamp is mounted on its left side, either toward the front or the rear corner.
Source: Arizona CDL Manual — Section 2: Driving Safely
6. The four-digit identification numbers first responders use are preceded by which letters?
Correct answer: 'NA' or 'UN'
An identification number is shown with the letters 'NA' or 'UN' in front of it, and the Emergency Response Guidebook links those numbers to specific chemicals.
Source: Arizona CDL Manual — Section 2: Driving Safely
7. Which hazard class is used for corrosives such as battery acid?
Correct answer: Class 8
Corrosive materials, including battery acid and hydrochloric acid, are grouped under Class 8.
Source: Arizona CDL Manual — Section 2: Driving Safely
8. Explosives such as dynamite and fireworks belong to which hazard class?
Correct answer: Class 1
Class 1 is reserved for explosives, a category that includes ammunition, dynamite, and fireworks.
Source: Arizona CDL Manual — Section 2: Driving Safely
9. On a downgrade, a sign reading 'Maximum Safe Speed' means what?
Correct answer: You must never exceed the speed shown
Where a speed limit or a 'Maximum Safe Speed' sign is posted on a grade, you must never go faster than the figure shown, and heed grade length and steepness warnings.
Source: Arizona CDL Manual — Section 2: Driving Safely
10. What color is the ABS malfunction lamp on a tractor's instrument panel?
Correct answer: Yellow
Tractors, trucks, and buses display a yellow ABS malfunction lamp; if it stays lit after the bulb check or comes on while driving, ABS control may be lost.
Source: Arizona CDL Manual — Section 2: Driving Safely
11. How many identical placards must a placarded vehicle display?
Correct answer: Four
A placarded load requires four matching placards — front, rear, and both sides — each readable from its direction.
Source: Arizona CDL Manual — Section 2: Driving Safely
12. The slow-moving-vehicle emblem you may see on farm machinery or tractors looks like what?
Correct answer: An orange-centered triangle bordered in red
The slow-moving-vehicle symbol is a reflective triangle with an orange center and a red border, warning you that the vehicle ahead travels well below normal speed.
Source: Arizona CDL Manual — Section 2: Driving Safely
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Every Arizona question is written from the official Arizona driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free