Delaware CDL — General Knowledge practice
Delaware 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
14 questions · pass with 11 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. Besides placards, where may a cargo tank or other bulk package show its contents' identification number?
Correct answer: On orange panels
Cargo tanks and other bulk packaging show the four-digit identification number either on the placards or on orange panels, so first responders can identify the material.
Source: Delaware Commercial Driver's Manual — Section 2.23.3, Lists of Regulated Products
2. From how many directions must a vehicle's hazardous materials placards be readable?
Correct answer: All four directions
The manual requires placards to be readable from all four directions, which is why a placarded vehicle shows them on the front, the rear, and each side.
Source: Delaware Commercial Driver's Manual — Section 2.23.3, Lists of Regulated Products
3. Two signs warn of a railroad-highway crossing: one is placed ahead of it, and one marks the crossing itself. Which sign marks the grade crossing?
Correct answer: The crossbuck
The round sign is the advance warning placed ahead of the crossing. The crossbuck marks the grade crossing itself and requires you to yield to trains.
Source: Delaware Commercial Driver's Manual — Section 2.15.2, Warning Signs and Devices
4. At night on a brightly lit commercial street, signs and shop windows make traffic signals hard to pick out. What does the manual advise?
Correct answer: Drive slower, so you can stop within the distance you can see
The manual warns that signals and hazards can be lost against signs, shop windows, and other lights. Its answer is to slow down when lighting is poor or confusing.
Source: Delaware Commercial Driver's Manual — Section 2.11.3, Roadway Factors
5. On the road test, where must you stop when a stop sign controls your lane?
Correct answer: Behind the stop sign, stop line, or crosswalk
The lane usage standard calls for stopping behind the stop line, the crosswalk, or the stop sign. Rolling past them counts against you.
Source: Delaware Commercial Driver's Manual — Section 13.1.14(d), Lane Usage
6. During the CDL road test, what should you be ready to do about any traffic sign that appears along the route?
Correct answer: Identify it and explain it to the examiner when asked
Besides clearance and weight-limit questions, the manual says to be prepared, when asked, to identify and explain any traffic sign that may appear on the route.
Source: Delaware Commercial Driver's Manual — Section 13.1.9, Bridge/Overpass/Sign
7. How many numbered hazard classes appear in the manual's hazard class table?
Correct answer: Nine
The table runs from Class 1, Explosives, through Class 9, Miscellaneous Hazardous Materials. ORM-D and Combustible Liquids are listed too, but with no class number.
Source: Delaware Commercial Driver's Manual — Section 2.23.3, Lists of Regulated Products
8. A vehicle that needs hazardous materials placards carries at least four identical ones. Where are they placed?
Correct answer: On the front, the rear, and both sides
Placards go on the front, on the rear, and on each side, so the hazard class of the cargo can be seen no matter where someone approaches from.
Source: Delaware Commercial Driver's Manual — Section 2.23.3, Lists of Regulated Products
9. For the road test's stop/start maneuver, the manual lists things your stopped vehicle should not block. Which list matches it?
Correct answer: Driveways, fire hydrants, intersections, and signs
Once stopped, the vehicle should sit parallel to the curb or shoulder, out of the traffic flow, without blocking driveways, hydrants, intersections, signs, and similar features.
Source: Delaware Commercial Driver's Manual — Section 13.1.6, Stop/Start
10. Which of these pairs of materials share a single hazard class on the manual's hazard class table?
Correct answer: Oxygen and helium
Oxygen and helium are both examples for Class 2, Gases. Gasoline is Class 3 while matches are Class 4; dynamite is Class 1 while uranium is Class 7; arsenic is Class 6 while acetone is Class 3.
Source: Delaware Commercial Driver's Manual — Section 2.23.3, Lists of Regulated Products
11. A delivery truck rated under 26,001 pounds displays hazardous materials placards. Under Delaware's CDL classes, what license does its driver need?
Correct answer: A Class C CDL
Class C covers vehicles under 26,001 pounds GVWR that carry 16 or more passengers or haul hazardous materials requiring placards. The placards also mean the driver needs the hazardous materials endorsement.
Source: Delaware Commercial Driver's Manual — Types of CDL
12. The manual gives three purposes for hazardous materials rules. Which purpose do shipping papers and diamond-shaped hazard labels serve?
Correct answer: Communicating the risk
The rules are meant to contain the product, communicate the risk, and ensure safe drivers and equipment. Shippers use the shipping paper and hazard labels to warn dockworkers and drivers, which is the communication purpose.
Source: Delaware Commercial Driver's Manual — Section 2.23.2, Why Are There Rules?
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