Maine CDL — General Knowledge practice
Maine 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.
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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. On Placard Table 2, which two entries show no placard name at all?
Correct answer: Infectious Substances (6.2) and ORM-D
Table 2 lists "(None)" in the placard column for Division 6.2 infectious substances and for ORM-D.
Source: Maine Commercial Driver License Manual — Section 9.3.11, Placard Tables
2. Most rows of the manual's hazard class table are numbered 1 through 9. Which two rows carry no class number?
Correct answer: ORM-D and Combustible Liquids
After the nine numbered classes, the table adds two rows marked "None": ORM-D, with hair spray and charcoal as examples, and Combustible Liquids, with fuel oils and lighter fluid.
Source: Maine Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
3. Which of these is NOT one of the positions where a placarded vehicle displays its placards?
Correct answer: The roof
A placarded vehicle carries at least four identical placards: front, rear and both sides, so they can be read from all four directions. None goes on the roof.
Source: Maine Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
4. You plan to take your Maine road test in a truck that displays hazardous materials placards. What does the manual say?
Correct answer: Placarded vehicles may not be used for road testing
Maine does not permit a vehicle placarded for hazardous materials to be used for the road test.
Source: Maine Commercial Driver License Manual — Definitions of Classes
5. When should the appropriate placards go on a vehicle that will carry hazardous materials?
Correct answer: Before you drive it
Placards are to be attached before the vehicle is driven. An improperly placarded vehicle may be moved only in an emergency, to protect life or property.
Source: Maine Commercial Driver License Manual — Section 9.3.10, Placarding
6. A bus driver notices a diamond-shaped hazard label on a parcel a rider wants stowed as baggage. What does the manual advise?
Correct answer: Refuse it unless you are certain the rules permit carrying it
Most hazardous materials cannot travel by bus. Drivers are told to watch for the diamond labels and to refuse any hazardous material unless they are certain the rules permit it.
Source: Maine Commercial Driver License Manual — Section 4.2.1, Hazardous Materials
7. During a roadside stop of a hazardous materials load, which of these may officers check, according to the hazardous materials section?
Correct answer: Your shipping papers, the vehicle's placards, your hazmat endorsement and your hazmat knowledge
The manual says officers who stop a hazmat vehicle may look at the shipping papers, the placards and the endorsement on the license, and may test what the driver knows about hazardous materials.
Source: Maine Commercial Driver License Manual — Section 9.1.3, Assure Safe Drivers and Equipment
8. A mixed load meets the conditions for DANGEROUS placards. Must the carrier use them?
Correct answer: No; the DANGEROUS placard is optional, and you can always placard for each material
The manual calls the DANGEROUS placard an option rather than a requirement. A carrier may always use the specific placards for the materials on board instead.
Source: Maine Commercial Driver License Manual — Section 9.3.11, Placard Tables
9. A crossing is marked only by a crossbuck, with no stop line on the pavement. A driver who is required to stop there halts 8 feet from the nearest rail. What is wrong?
Correct answer: The stop is too close; the vehicle must be no nearer than 15 feet from the nearest rail
Where no stop line is painted, a vehicle that must stop does so between 15 and 50 feet from the nearest rail. Eight feet is inside the 15-foot minimum.
Source: Maine Commercial Driver License Manual — Section 2.15.2, Warning Signs and Devices
10. According to the bus section, what must a shipper mark on a container of hazardous material?
Correct answer: The material's name, its identification number and a hazard label
The rules make shippers mark hazardous containers three ways: with the name of the material, its identification number and a hazard label.
Source: Maine Commercial Driver License Manual — Section 4.2.1, Hazardous Materials
11. Maine's H endorsement covers vehicles carrying hazardous material in which situation?
Correct answer: When federal DOT regulation requires the load to be placarded
The H endorsement is tied to placarding: it applies when the hazardous material being carried must be placarded under federal DOT regulation.
Source: Maine Commercial Driver License Manual — Endorsement
12. At many highway-rail crossings, what is mounted with the crossbuck sign to warn that a train is coming?
Correct answer: Flashing red lights and bells
Many grade crossings add flashing red lights and bells to the crossbuck. When the lights start flashing, you stop and yield to the train.
Source: Maine Commercial Driver License Manual — Section 2.15.2, Warning Signs and Devices
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