Kansas CDL — General Knowledge: Road Signs Practice Test

Question 1

What does the safety arm on the front of a school bus do?

Accepted Answer

Makes students cross well away from the front bumper, where the driver can see them — The safety arm swings out so that students crossing in front of the bus stay well away from it (about 10 feet) and within the driver's view.

Answer

Tells the driver every student is seated

Answer

Blocks traffic in the opposite lane

Answer

Holds the entry door open

Question 2

What is the job of the stop arm on a school bus?

Accepted Answer

To warn other drivers that the bus is stopping or stopped — The stop arm warns other drivers that the school bus is about to stop or is already stopped.

Answer

To mark the rear emergency door

Answer

To show that the bus is turning right

Answer

To keep students in their seats

Question 3

A shipment is placarded as Class 7. Which material from the manual's hazard class table fits that class?

Accepted Answer

Plutonium — Class 7 covers radioactive materials; the table's examples are uranium and plutonium.

Answer

Formaldehyde

Answer

Hydrochloric acid

Answer

Oxygen

Question 4

Fuel oils and lighter fluid appear in the hazard table as 'Combustible Liquids.' What class number does the table assign them?

Accepted Answer

None — no class number is given — Combustible liquids, like ORM-D materials, are shown with no class number in the manual's table.

Answer

Class 4

Answer

Class 9

Answer

Class 3

Question 5

You are approaching an overpass and doubt your rig will fit under it. What should you do?

Accepted Answer

Go slowly, and if you still aren't sure you'll clear it, take another route — When safe overhead space is in doubt, creep forward slowly; if you remain unsure, choose a different route.

Answer

Speed up so the suspension compresses

Answer

Rely on the posted clearance figure

Answer

Let air out of the tires to lower the vehicle

Question 6

Which of these is an example the manual gives for Class 5, Oxidizers?

Accepted Answer

Hydrogen peroxide — The table lists ammonium nitrate and hydrogen peroxide as oxidizers. Helium is a gas, acetone is flammable, and asbestos is miscellaneous.

Answer

Asbestos

Answer

Acetone

Answer

Helium

Question 7

Signs ahead warn of fog, and you have no choice but to keep driving. How should you respond to them?

Accepted Answer

Obey every fog-related warning sign and slow down before you reach the fog — If you must drive in fog, follow all fog warning signs and reduce speed before entering it. Don't count on the fog thinning out once you're inside.

Answer

Expect the fog to thin once you are in it

Answer

Switch to high beams so the signs are easier to read

Answer

Hold your speed until you can actually see the fog

Question 8

For the vehicle inspection test, which type of vehicle does the manual say needs reflective tape?

Accepted Answer

Trailers — Reflective tape is required only on trailers, though some jurisdictions may also require it on school buses.

Answer

Only vehicles rated over 80,000 pounds

Answer

Every straight truck

Answer

Only tank vehicles

Question 9

Which of these is NOT an example the manual gives for its listed hazard class?

Accepted Answer

Class 4, Flammable Solids — lighter fluid — Lighter fluid is listed as a combustible liquid; the Class 4 examples are matches and fuses. The other three pairings match the table.

Answer

Class 9, Miscellaneous — asbestos

Answer

Class 7, Radioactive — uranium

Answer

Class 1, Explosives — ammunition

Question 10

Which special equipment may an oversized load need so other drivers notice it?

Accepted Answer

'Wide load' signs, flashing lights, and flags — Over-length, over-width, or overweight loads may need equipment such as 'wide load' signs, flashing lights, and flags.

Answer

Nothing beyond the normal lights

Answer

Orange identification number panels

Answer

Hazardous materials placards

Question 11

Which pairing of hazard class and example matches the manual's table?

Accepted Answer

Class 6, Poisons — pesticides — Pesticides and arsenic are the table's Class 6 examples. Helium is a gas, dynamite is an explosive, and gasoline is flammable.

Answer

Class 7, Radioactive — helium

Answer

Class 2, Gases — dynamite

Answer

Class 9, Miscellaneous — gasoline

Question 12

Can a single four-digit hazardous materials identification number stand for more than one chemical on shipping papers?

Accepted Answer

Yes, one number may identify more than one chemical — First responders use the four-digit numbers, and the manual notes that one number may be used for more than one chemical.

Answer

Only for Class 9 materials

Answer

Only when it is preceded by the letters 'UN'

Answer

No, every number belongs to exactly one chemical

Kansas CDL — General Knowledge: Road Signs practice test

Study questions with answers

1. What does the safety arm on the front of a school bus do?

2. What is the job of the stop arm on a school bus?

3. A shipment is placarded as Class 7. Which material from the manual's hazard class table fits that class?

4. Fuel oils and lighter fluid appear in the hazard table as 'Combustible Liquids.' What class number does the table assign them?

5. You are approaching an overpass and doubt your rig will fit under it. What should you do?

6. Which of these is an example the manual gives for Class 5, Oxidizers?

7. Signs ahead warn of fog, and you have no choice but to keep driving. How should you respond to them?

8. For the vehicle inspection test, which type of vehicle does the manual say needs reflective tape?

9. Which of these is NOT an example the manual gives for its listed hazard class?

10. Which special equipment may an oversized load need so other drivers notice it?

11. Which pairing of hazard class and example matches the manual's table?

12. Can a single four-digit hazardous materials identification number stand for more than one chemical on shipping papers?

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