Nebraska CDL — General Knowledge: Road Signs Practice Test

Question 1

On the CDL road test you have just driven under an overpass. What may the examiner ask you?

Accepted Answer

What the posted clearance or height was — After an overpass the examiner may ask for the posted clearance or height. After a bridge, the question may be about the posted weight limit.

Answer

How many lanes passed beneath it

Answer

What year it was built

Answer

What the speed limit will be at the next exit

Question 2

The hazard class table in Section 2 lists ORM-D with no class number. Which examples does it give for ORM-D?

Accepted Answer

Hair spray or charcoal — ORM-D, Other Regulated Material-Domestic, is illustrated with hair spray or charcoal. Fuel oils and lighter fluid are the examples for combustible liquids.

Answer

Fuel oils or lighter fluid

Answer

Matches or fuses

Answer

Pesticides or arsenic

Question 3

In states that have move-over laws, how does the manual say drivers are told about them?

Accepted Answer

Signs are posted on the roadways — The manual notes that signs are posted on roadways in the states that have enacted move-over laws.

Answer

Notices are printed on each CDL

Answer

Carriers must brief drivers every year

Answer

Flashing beacons mark each mile

Question 4

On a tractor-trailer, where may the front hazardous materials placard be displayed?

Accepted Answer

At the front of either the tractor or the trailer — Placards go on each side and each end of the vehicle, and the manual lets the front one sit on the tractor's front or the trailer's front.

Answer

Only on the tractor's front bumper

Answer

Only on the nose of the trailer

Answer

On either cab door

Question 5

A vehicle carrying hazardous materials is not correctly placarded. When does the manual allow it to be moved?

Accepted Answer

Only during an emergency, to protect life or property — Placards are to be attached before the vehicle is driven. The single exception is an emergency in which moving the vehicle protects life or property.

Answer

Any time, if the trip is under 25 miles

Answer

Whenever the shipping papers are in order

Answer

Only in daylight

Question 6

In its placarding rules, what does the manual say about displays such as 'Drive Safely'?

Accepted Answer

Such slogans are prohibited — 'Drive Safely' and similar slogans may not be used, according to the placarding rules.

Answer

They are required when no hazardous material is aboard

Answer

They may replace the front placard

Answer

They are allowed if printed in black on white

Question 7

You have to drive through fog. What does the manual say about fog-related warning signs?

Accepted Answer

Obey every one of them — The first item on the manual's list for driving in fog is to obey all warning signs related to fog.

Answer

Treat them as advisory when traffic is light

Answer

They apply only after dark

Answer

They apply only to vehicles without fog lights

Question 8

What shape does a hazardous materials placard present on the outside of a vehicle?

Accepted Answer

A square turned upright on one point, forming a diamond — Placards are squares at least 9.84 inches on a side that are set upright on a point so they appear as a diamond.

Answer

A circle with the class number in the center

Answer

A rectangle mounted with its long edge level

Answer

A triangle with one point facing down

Question 9

Which pairing does NOT match the hazard class table that Section 2 gives all commercial drivers?

Accepted Answer

Class 8, Corrosives: gasoline and acetone — Gasoline and acetone are the table's examples for Class 3, Flammable. Class 8, Corrosives, lists hydrochloric acid and battery fluid.

Answer

Class 1, Explosives: ammunition and dynamite

Answer

Class 5, Oxidizers: ammonium nitrate and hydrogen peroxide

Answer

Class 7, Radioactive: uranium and plutonium

Question 10

On a two-lane road, which sign does the manual say is also found at a railroad crossing approach, along with the pavement markings?

Accepted Answer

A no-passing zone sign — The manual says a no-passing zone sign is used on two-lane roads at railroad crossings, in addition to the no-passing marking on the pavement.

Answer

A minimum speed sign

Answer

A truck route sign

Answer

A weight limit sign

Question 11

How far must a hazardous materials placard be kept from any other markings on the vehicle?

Accepted Answer

At least three inches — Each placard has to sit three inches or more from other markings.

Answer

At least one inch

Answer

At least two inches

Answer

At least six inches

Question 12

The round, black-on-yellow sign ahead of a public railroad crossing tells drivers to slow down and be ready to stop. Which vehicles does the manual say are required to stop?

Accepted Answer

All passenger and hazmat carrying vehicles — In its description of the advance warning sign, the manual adds that all passenger-carrying and hazmat-carrying vehicles must stop at the crossing.

Answer

Only vehicles over 26,001 pounds

Answer

Only vehicles pulling trailers

Answer

Every commercial vehicle, loaded or empty

Nebraska CDL — General Knowledge: Road Signs practice test

Study questions with answers

1. On the CDL road test you have just driven under an overpass. What may the examiner ask you?

2. The hazard class table in Section 2 lists ORM-D with no class number. Which examples does it give for ORM-D?

3. In states that have move-over laws, how does the manual say drivers are told about them?

4. On a tractor-trailer, where may the front hazardous materials placard be displayed?

5. A vehicle carrying hazardous materials is not correctly placarded. When does the manual allow it to be moved?

6. In its placarding rules, what does the manual say about displays such as 'Drive Safely'?

7. You have to drive through fog. What does the manual say about fog-related warning signs?

8. What shape does a hazardous materials placard present on the outside of a vehicle?

9. Which pairing does NOT match the hazard class table that Section 2 gives all commercial drivers?

10. On a two-lane road, which sign does the manual say is also found at a railroad crossing approach, along with the pavement markings?

11. How far must a hazardous materials placard be kept from any other markings on the vehicle?

12. The round, black-on-yellow sign ahead of a public railroad crossing tells drivers to slow down and be ready to stop. Which vehicles does the manual say are required to stop?

More CDL — General Knowledge topics

Practice Road Signs in another state