Alaska CDL — General Knowledge practice
Alaska 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. During the road test the examiner asks what the posted weight limit was. What did you most likely just drive over?
Correct answer: A bridge
The weight-limit question follows a bridge. After an overpass, the question is about the posted clearance or height instead.
Source: Alaska Commercial Driver License Manual — Section 13.1.9, Bridge/Overpass/Sign
2. On the manual's hazard class table, asbestos and formaldehyde are examples of which class?
Correct answer: Class 9, Miscellaneous Hazardous Materials
The table lists formaldehyde and asbestos as examples of Class 9, Miscellaneous Hazardous Materials.
Source: Alaska Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
3. What does the advance warning sign placed ahead of a public railroad crossing look like?
Correct answer: Round, with black markings on a yellow background
The advance warning sign is round with black on a yellow background. It warns you to reduce speed, watch and listen for a train, and be ready to stop.
Source: Alaska Commercial Driver License Manual — Section 2.15.2, Warning Signs and Devices
4. A marine pollutant shipped in bulk packaging needs a special marking, which also goes on the outside of the vehicle. What does it look like?
Correct answer: A white triangle showing a fish that is crossed out with an X
The Marine Pollutant marking is a white triangle containing a fish with an X over it. It is a marking, not a placard, and the shipping papers must also note 'Marine Pollutant.'
Source: Alaska Commercial Driver License Manual — Section 9.3.3, Lists of Regulated Products
5. Which of these does the manual list as a possible distraction outside the vehicle?
Correct answer: Reading billboards or other road advertisements
Reading billboards and other roadside advertising is on the manual's list of outside distractions. The other three choices are on its list of distractions inside the vehicle.
Source: Alaska Commercial Driver License Manual — Section 2.9, Distracted Driving
6. A railroad crossing on a school bus route has no painted stop line. Using the school bus section's rule, where does the driver stop the bus?
Correct answer: Before the cross-buck sign
Where a stop line exists the front of the bus stays behind it. With no line on the pavement, the bus must be stopped before it reaches the cross-buck sign.
Source: Alaska Commercial Driver License Manual — Section 10.4.2, Warning Signs and Devices
7. During the walk-around of an oversize load, what must you confirm besides properly mounted signs, flags, lamps, and reflectors?
Correct answer: That all required permits are in your possession
For an oversize load, the walk-around covers the required signs and their safe mounting, and also that the driver is carrying every required permit.
Source: Alaska Commercial Driver License Manual — Section 2.1.5, Seven-step Inspection Method
8. Who supplies the placards for a hazardous materials shipment, according to the hazardous materials section?
Correct answer: The shipper
The shipper's duties include packaging, marking, and labeling the materials, preparing shipping papers, giving emergency response information, and supplying the placards.
Source: Alaska Commercial Driver License Manual — Section 9.2.1, The Shipper
9. On the manual's detailed hazard class chart, what is the name of Division 4.3?
Correct answer: Dangerous When Wet
Class 4 is split into 4.1 Flammable Solids, 4.2 Spontaneously Combustible, and 4.3 Dangerous When Wet.
Source: Alaska Commercial Driver License Manual — Section 9.3.1, Definitions
10. Your truck's cargo includes hazardous materials. What must your vehicle inspection also cover?
Correct answer: Proper shipping papers and placarding
Besides checking for overloading and for balanced, secured cargo, a load with hazardous materials must be inspected for the right papers and placards.
Source: Alaska Commercial Driver License Manual — Section 2.1.3, What to Look For
11. What three facts let you decide which placards a load requires?
Correct answer: The material's hazard class, the amount being shipped, and the total amount of all hazardous materials on the vehicle
Placarding depends on quantity and hazard class, so you need the hazard class of the material, how much is being shipped, and the total of all classes of hazardous materials on board.
Source: Alaska Commercial Driver License Manual — Section 9.3.3, Lists of Regulated Products
12. Why can failing to placard a load that needs placards put your life at risk after a crash?
Correct answer: Emergency responders will not know hazardous cargo is aboard
Placards tell responders what is aboard. Without them, the emergency help that arrives will not know about your hazardous cargo.
Source: Alaska Commercial Driver License Manual — Section 2.23.3, Lists of Regulated Products
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