Tennessee CDL — General Knowledge: Road Signs Practice Test

Question 1

A slow-moving vehicle such as farm equipment often displays what emblem to warn faster traffic?

Accepted Answer

A red triangle with an orange center — The slow-moving emblem uses a red triangle framing an orange middle, warning that the vehicle ahead moves well under normal speed.

Answer

A solid blue circle

Answer

A green square with white borders

Answer

A black diamond on white

Question 2

On a two-lane road, an 'X' pattern painted on the pavement with the letters 'RR' warns a driver of what?

Accepted Answer

An upcoming railroad crossing, the same message the advance warning sign gives — Pavement markings with an X and RR carry the same meaning as the advance warning sign, alerting you that a railroad crossing lies ahead.

Answer

A parking area reserved for rail employees

Answer

The end of a passing zone for cars only

Answer

A weigh-station exit for trucks

Question 3

How many identical placards must a placarded hazardous-materials vehicle display, and where?

Accepted Answer

Four matching placards on the front, rear, and both sides — A placarded load requires four identical placards, one on the front, one on the rear, and one on each side.

Answer

One placard on the rear only

Answer

Two placards, one on each side

Answer

Three placards spaced along the trailer roof

Question 4

Hazardous-materials placards on a commercial vehicle are shaped and displayed how?

Accepted Answer

Diamond-shaped signs set upright on a point, visible from all four directions — Placards are diamond-shaped signs turned upright on a point and must be readable from all four sides of the vehicle.

Answer

Round signs mounted only on the rear

Answer

Rectangular panels placed on the driver door

Answer

Triangular reflectors attached to the bumper

Question 5

When the red lights at a railroad crossing begin flashing, what must a commercial driver do?

Accepted Answer

Stop, because a train is coming, and yield to it — Flashing red lights warn that a train is coming; you must stop and let it pass before proceeding.

Answer

Proceed quickly across before the train reaches the crossing

Answer

Continue at the same speed if no gate has dropped yet

Answer

Treat the lights as a caution and roll through slowly

Question 6

At a crossing equipped with gates and flashing lights, when may a driver proceed across the tracks?

Accepted Answer

Only after the gates have raised, the lights have stopped, and the way is clear — You must stop when the lights flash and before the gate lowers, then stay stopped until the gates rise and the lights stop flashing and it is safe.

Answer

As soon as the lights start flashing but before the gate moves

Answer

By carefully steering around a lowered gate when no train is visible

Answer

Whenever traffic behind begins honking

Question 7

Signs enacted under 'move-over' laws direct drivers approaching a stopped emergency vehicle to do what?

Accepted Answer

Slow down and, if safe, move into a lane not next to the emergency vehicle — Move-over laws require you to slow down and, when it is safe, change into a lane away from the stopped emergency vehicle or roadside crew.

Answer

Maintain speed and stay in the lane nearest the vehicle

Answer

Stop completely in the travel lane until the emergency vehicle leaves

Answer

Sound the horn continuously while passing

Question 8

A round warning sign with a black symbol on a yellow background placed on the approach to a railroad crossing is telling a commercial driver to do what?

Accepted Answer

Reduce speed, look and listen for a train, and be prepared to stop if one approaches — The round advance warning sign means slow down, watch and listen for a train, and be ready to stop at the tracks if one is coming.

Answer

Come to a complete halt every time, whether or not a train is near

Answer

Speed up so you clear the tracks before any possible train arrives

Answer

Ignore the tracks unless a gate is already lowered

Question 9

In the hazard-class table, corrosives like battery fluid and hydrochloric acid belong to which class?

Accepted Answer

Class 8 — Corrosive materials such as battery fluid and hydrochloric acid are grouped under hazard Class 8.

Answer

Class 2

Answer

Class 5

Answer

Class 9

Question 10

A sign mounted just below a crossbuck reading '2 TRACKS' tells the driver what?

Accepted Answer

There are two railroad tracks to cross at that location — A number panel below the crossbuck indicates how many separate sets of tracks the road crosses, so you know to check each one.

Answer

The crossing is limited to vehicles under two tons

Answer

A train will arrive within two minutes

Answer

Two lanes must merge before the tracks

Question 11

A downgrade sign reading 'Maximum Safe Speed' tells a truck driver what?

Accepted Answer

A speed you must never go faster than while descending — When a maximum-safe-speed figure is posted for a grade, you must never exceed the speed shown on that sign.

Answer

The minimum speed you must keep to stay in the lane

Answer

A suggested speed only cars need to obey

Answer

The speed at which the engine brake shuts off

Question 12

What does a crossbuck sign at a highway-rail grade crossing require of a commercial driver?

Accepted Answer

Yield the right-of-way to any approaching train — The crossbuck marks the grade crossing and requires you to give the right-of-way to any train that is approaching.

Answer

Stop for a fixed period of thirty seconds before crossing

Answer

Sound the horn twice regardless of whether a train is present

Answer

Reverse away from the tracks until the signal clears

Road Signs

Study questions with answers

1. A slow-moving vehicle such as farm equipment often displays what emblem to warn faster traffic?

2. On a two-lane road, an 'X' pattern painted on the pavement with the letters 'RR' warns a driver of what?

3. How many identical placards must a placarded hazardous-materials vehicle display, and where?

4. Hazardous-materials placards on a commercial vehicle are shaped and displayed how?

5. When the red lights at a railroad crossing begin flashing, what must a commercial driver do?

6. At a crossing equipped with gates and flashing lights, when may a driver proceed across the tracks?

7. Signs enacted under 'move-over' laws direct drivers approaching a stopped emergency vehicle to do what?

8. A round warning sign with a black symbol on a yellow background placed on the approach to a railroad crossing is telling a commercial driver to do what?

9. In the hazard-class table, corrosives like battery fluid and hydrochloric acid belong to which class?

10. A sign mounted just below a crossbuck reading '2 TRACKS' tells the driver what?

11. A downgrade sign reading 'Maximum Safe Speed' tells a truck driver what?

12. What does a crossbuck sign at a highway-rail grade crossing require of a commercial driver?

More CDL — General Knowledge topics

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