Road Signs

Study questions with answers

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.

1. 1. A posted move-over law requires an approaching driver to:

   Correct answer: slow down and move out of the lane next to a stopped emergency vehicle when safe

   Move-over laws require drivers to slow down and, when safe, move into a lane not next to a stopped emergency vehicle or work zone.

   Source: KY CDL Manual, Sec 2.8 Move-Over Laws

2. 2. At a crossing marked only with a crossbuck sign, what is a driver required to do?

   Correct answer: Give the right-of-way to any approaching train

   A crossbuck marks the grade crossing and requires you to yield to any train that is approaching.

   Source: KY CDL Manual, Sec 2.15 Warning Signs and Devices

3. 3. In the hazard class system, which class number covers explosives such as dynamite and fireworks?

   Correct answer: Class 1

   The manual assigns explosives, including ammunition, dynamite, and fireworks, to hazard Class 1.

   Source: KY CDL Manual, Sec 2.23 Hazard Class Definitions

4. 4. Gasoline and acetone are grouped under which hazard class?

   Correct answer: Class 3, Flammable

   Flammable materials such as gasoline and acetone are listed as hazard Class 3.

   Source: KY CDL Manual, Sec 2.23 Hazard Class Definitions

5. 5. Signs posted a few miles from the top of a mountain downgrade usually point out the location of:

   Correct answer: escape ramps that can stop a runaway vehicle

   Escape ramps use a bed of loose material and sometimes an upgrade to stop a runaway vehicle; signs tell drivers where these ramps are.

   Source: KY CDL Manual, Sec 2.16 Proper Braking Technique

6. 6. What does a round, yellow sign bearing a black 'X' and two 'R' letters tell a commercial driver to do?

   Correct answer: Slow down, watch and listen for a train, and be ready to stop

   The round black-on-yellow advance warning sign means a rail crossing is ahead, so slow down, look and listen for a train, and be ready to stop.

   Source: KY CDL Manual, Sec 2.15 Warning Signs and Devices

7. 7. The four-digit identification number that first responders use to identify a hazardous material is preceded by the letters:

   Correct answer: 'NA' or 'UN'

   An identification number is a four-digit code preceded by the letters 'NA' or 'UN' so responders can identify the chemical.

   Source: KY CDL Manual, Sec 2.23 Lists of Regulated Products

8. 8. When a sign posts a 'Maximum Safe Speed' before a downgrade, a truck driver should:

   Correct answer: never travel faster than the speed shown

   If a maximum safe speed is posted, you must never go faster than the figure shown, and you should heed signs about the grade's length and steepness.

   Source: KY CDL Manual, Sec 2.16 Select a Safe Speed

9. 9. An 'X' with the letters 'RR' painted on the road surface carries the same meaning as:

   Correct answer: the advance warning sign for a rail crossing

   Pavement markings, an X with RR plus a no-passing marking on two-lane roads, mean the same thing as the advance warning sign for a crossing.

   Source: KY CDL Manual, Sec 2.15 Pavement Markings

10. 10. On a two-lane road approaching railroad tracks, the pavement markings also include a:

    Correct answer: no-passing marking

    The road markings before a two-lane crossing consist of an X, the letters RR, and a no-passing marking.

    Source: KY CDL Manual, Sec 2.15 Pavement Markings

11. 11. How many identical placards must be displayed on a vehicle that requires placarding?

    Correct answer: Four, on the front, rear, and both sides

    A placarded vehicle must show at least four matching placards, one on the front, one on the rear, and one on each side, readable from all directions.

    Source: KY CDL Manual, Sec 2.23 Lists of Regulated Products

12. 12. What shape are the hazard placards mounted on the outside of a commercial vehicle?

    Correct answer: A square standing on one point, forming a diamond

    Placards are at least 9.84 inches square and set upright on one point, forming a diamond shape.

    Source: KY CDL Manual, Sec 2.23 Lists of Regulated Products