They alert drivers to potential tire problems.

They test a vehicle's shock absorbers.

Through vibration and sound, they alert inattentive drivers to the fact that their vehicles have left the travel lane.

If it has been raining several hours.

If it has just begun to rain.

If it has been raining for one to two hours.

Up the instrumental panel lights.

On your parking lights.

On your headlights.

Have a red background with green writing.

Have an orange background with black writing.

Have a yellow background with blue writing.

Low beam headlights.

High beam headlights.

Parking lights.

During the night.

During the day.

Under ideal conditions.

Before you start driving.

Whenever you need to use them.

Before you get into the car.

Immediately enter the far-right traffic lane on the interstate and speed up to match the flow of traffic.

Use the shoulder of the main road to get up to the speed of traffic.

Speed up and enter the interstate only after you have identified a gap in traffic.

You cannot cross the line to pass.

You may cross the line to pass and change lanes.

You may only cross the line to change lanes if you are in the left lane.

10 mph.

15 mph.

25 mph.

Make eye contact with and then pass the pedestrian.

Slow down as you pass the pedestrian.

Stop and let the pedestrian finish crossing the street.

Sharp right turn ahead.

A road joins from the right.

The road ahead turns sharply right then sharply left.

Obey the officer.

Obey the traffic signal.

Do what the vehicle in front of you does.

Do not enter.

Stop ahead.

Roadwork or maintenance is present.

If the other driver signals for you to re-enter the lane.

If you look over your shoulder and see the passed car behind you.

If you can see both of the passed vehicle's headlights in your rearview mirror.

Passing is prohibited from both directions.

Passing is permitted from both directions.

Passing is permitted only from the direction next to the dashed line.

Slow down because the lane ends ahead.

Be prepared for workers and equipment ahead.

Change lanes and maintain your current speed.

Steep grade ahead.

The road ahead winds with a series of turns or curves.

Slippery when wet.

Yield sign ahead.

Side road entering from left.

Stop sign ahead.

You increase your speed before the turn.

Traffic on the street moves to the right.

Traffic on the street moves to the left.

Only a passenger in the front seat.

Only passengers age 16 or below.

Passengers in the front seat and passengers age 16 and below.

Another vehicle is in your way.

It may help prevent a collision.

Another driver makes a mistake.

The speed limit is increased at night.

There are fewer cars on the roads at night.

Distance and vehicle speed are difficult to judge in the dark.

Driving 10 mph faster than the car behind you.

Driving 10 mph slower than the car behind you.

Maintaining a steady speed.

The vehicle has the right-of-way.

Slow-moving vehicle.

Shoulder work ahead.

Check your side mirror and look over your shoulder to make sure the lane is clear.

Check the inside rearview mirror.

Slow down.

You must travel through the intersection at the posted speed limit.

The maximum speed limit under ideal conditions is 55 mph.

You must not travel below the speed indicated.

Frequently check your rearview mirror.

Turn and look out your back window.

Keep other vehicles out of your blind spots.

Always stop, whether there is a stop sign or not.

Watch for children and be ready to stop.

Always sound your horn when you see children.

Move into another lane while within an intersection.

Check your blind spot by looking over your shoulder.

Check for other drivers moving into the same lane.