Connecticut CDL — General Knowledge practice
Connecticut 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
13 questions · pass with 10 correct. You get instant feedback and an explanation after every answer.
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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.
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1. What does an X-shaped crossbuck sign at a grade crossing require of a driver?
Correct answer: Give the train the right-of-way at the crossing
The crossbuck marks the crossing and tells you to give the right-of-way to any train that is using the tracks.
Source: Connecticut CDL Manual - Section 2: Driving Safely
2. How many separate hazard classes are listed in the hazardous-materials class chart?
Correct answer: Nine
The chart lists nine numbered hazard classes, from explosives through miscellaneous hazardous materials.
Source: Connecticut CDL Manual - Section 2: Driving Safely
3. When a downgrade sign reads 'Maximum Safe Speed,' what should a commercial driver do?
Correct answer: Never travel faster than the number shown
A posted maximum-safe-speed figure is an upper limit you must never go above on that grade.
Source: Connecticut CDL Manual - Section 2: Driving Safely
4. What shape must a hazardous-materials placard be displayed in on a vehicle?
Correct answer: A square turned to sit on one of its points
Placards are square-on-point signs, tilted so they form a diamond, making them easy for responders to recognize from any direction.
Source: Connecticut CDL Manual - Section 2: Driving Safely
5. The four-digit identification number for a hazardous material on a placard or orange panel is preceded by which letters?
Correct answer: NA or UN
Identification numbers used by first responders are shown with the prefix 'NA' or 'UN' in front of the four-digit code.
Source: Connecticut CDL Manual - Section 2: Driving Safely
6. What is the minimum required size of a hazardous-materials placard?
Correct answer: At least 9.84 inches (250 mm) square
Placards must measure at least 9.84 inches (250 mm) on each side and stand upright on a point in a diamond form.
Source: Connecticut CDL Manual - Section 2: Driving Safely
7. On the hazard-class chart, gasoline and acetone fall under which numbered class?
Correct answer: Class 3
Flammable liquids such as gasoline and acetone are grouped as hazard Class 3.
Source: Connecticut CDL Manual - Section 2: Driving Safely
8. The slow-moving-vehicle emblem you may see on farm equipment is what shape and color?
Correct answer: A red-bordered triangle with an orange middle
A slow-moving vehicle is marked by a triangle that is red around its edge with an orange center, warning you to expect very low speeds.
Source: Connecticut CDL Manual - Section 2: Driving Safely
9. What is an escape ramp, which is marked by signs on mountain downgrades?
Correct answer: A soft-surface bed built to stop a runaway vehicle
An escape ramp is a bed of loose, soft material, sometimes on an upgrade, built to bring a runaway truck safely to a stop.
Source: Connecticut CDL Manual - Section 2: Driving Safely
10. How many identical placards must be shown on a vehicle that is required to be placarded?
Correct answer: Four
A placarded load carries four matching placards, one on the front, one on the rear, and one on each side.
Source: Connecticut CDL Manual - Section 2: Driving Safely
11. Battery acid and hydrochloric acid are examples of which hazard class?
Correct answer: Class 8
Corrosive substances like battery acid belong to hazard Class 8.
Source: Connecticut CDL Manual - Section 2: Driving Safely
12. What does the round warning sign posted ahead of a public railroad crossing look like?
Correct answer: Black lettering on a yellow round sign
The advance-warning marker for a grade crossing is a round sign with black symbols on a yellow background, telling you to slow, look and listen.
Source: Connecticut CDL Manual - Section 2: Driving Safely
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