When driving in a work zone, adjust your speed for the traffic conditions and don't follow other vehicles too closely. Be attentive to workers and machines in the work zone.

If you want to enter the freeway but do not see a space for your vehicle in traffic, slow down on the ramp to wait for a gap. Do not drive to the end of the ramp and wait for a gap or you will not have enough room to accelerate to the speed of traffic before entering the roadway.

You must yield the right-of-way to any emergency vehicle that is using its siren and flashing lights. Do this by driving to the right edge of the road and stopping, taking care not to stop in an intersection. You may move again after the emergency vehicle has passed.

You must approach all railroad crossings with extreme caution and cross only when you know that no train is coming from either direction. Be aware of vehicles that must stop at all railroad crossings, such as school buses and trucks carrying hazardous materials.

Pavement on bridges and overpasses can become icy even when other surrounding pavement is dry. Bridges often freeze before, and thaw out after, the rest of a road.

This sign indicates that there is a yield sign ahead. You should begin to slow down when you see this warning sign.

This sign warns that the road ahead becomes slippery when wet.

Backing up is always dangerous because it is hard to see behind your vehicle. Use extra caution when backing up.

When driving in fog, you should slow down and use your low beam lights. If the fog is so dense that you cannot see, pull off the road and wait for the fog to clear.

A three-sided yield sign indicates that you are approaching an intersection where you must wait for vehicles on the other roadway to pass before you proceed. You do not need to come to a complete stop if you are sure that no other vehicles are coming, but you should still always slow down and enter the intersection with caution.

Hydroplaning occurs when there is standing water on a roadway. At speeds up to 35 mph, most tires will channel water away from the tire. As your speed increases past 35 mph, tires cannot channel the water as well and your tires may start to lose contact with the road and ride over the water like a set of water skis.

Pedestrians who use guide dogs or white canes (with or without a red tip) must be given the right-of-way at all times.

This sign is placed on roads near schools to warn drivers to slow down, drive with caution, and watch for children.

When a stopped school bus is using its flashing red lights, approaching drivers must stop and remain stopped until the lights stop flashing. If the school bus is on the opposite side of a divided highway, drivers do not need to stop.

To stay aware of hazards, you should scan the road and check your rearview mirrors every two to five seconds. Constantly staring at just the road ahead of you is dangerous. If you must drive in foggy conditions, you should use your low beam headlights, not your high beam headlights.

When parking either uphill or downhill on a road that has no curb, you should turn your wheels so that the vehicle will roll away from the center of the road if the brakes fail.

Watch for any pedestrian who may cross your path. If you see pedestrians near the road where you are driving, slow down and be prepared to stop, if necessary.

Because large trucks require more time to accelerate than smaller vehicles, trucks can lose speed driving up long or steep hills. Be cautious when driving behind a large truck and be sure to give the vehicle additional space, especially when driving on an incline.

Warning signs provide notice to road users of a situation that might not be readily apparent and are usually yellow with black markings. This sign warns drivers of an upcoming steep hill. Drivers should adjust their speed accordingly to avoid collisions and brake damage.

Fatigue causes errors related to speed and distance, increases your risk of being in a crash, and causes you to take more time to make decisions. When you are fatigued, you could fall asleep behind the wheel and crash, injuring or killing yourself or others.

An octagonal sign always means stop. When approaching a stop sign, you must come to a complete stop at the marked stop line and proceed only when it is safe to do so. If there is no stop line, stop before the crosswalk. If there is no crosswalk, stop before the intersection at a point from which you can see any oncoming traffic.

When driving in heavy rain at speeds as low as 30 mph, your tires may lose all contact with the road and instead ride up on a layer of water above the surface of the road. This is called "hydroplaning." If your vehicle starts to hydroplane, slow down gradually and do not apply the brakes.

A flashing red light at an intersection means drivers are required to come to a complete stop, yield to traffic and pedestrians, and proceed when the way is clear. The same is true at a stop sign.

Before merging into interstate traffic, you should identify a gap, accelerate to the speed of traffic, and signal. Merge into the gap when it is safe to do so. Be alert to other traffic and do not expect other drivers to clear the lane.

An octagonal sign always means stop. When approaching a stop sign, you must come to a complete stop at the marked stop line and proceed only when it is safe to do so. If there is no stop line, stop before the crosswalk. If there is no crosswalk, stop before the intersection at a point from which you can see oncoming traffic.

Drinking alcohol at a faster rate will lead to a higher level of intoxication. For example, drinking three drinks in one hour affect a person more acutely than drinking the same three drinks over the course of three hours. As a person's weight increases, the amount of alcohol required to raise their blood alcohol content (BAC) increases. When comparing two people of the same weight, the person with more body fat will show signs of intoxication first, since their body contains proportionally less water in which to dissolve the alcohol.

A flashing red traffic light means the same thing as a stop sign. When arriving at an intersection with a flashing red light, you must come to a full stop and proceed when it is safe to do so.

If you try to insert your vehicle between a turning truck or bus and a curb, you may suffer a serious crash. To avoid a collision, do not turn until the truck or bus has completed its turn.

After a collision, if no one has been injured or killed and you can safely do so, you should move your vehicle out of the traffic lane.

A reflective orange triangle on the rear of a vehicle means it travels only at slow speeds. You may see this sign on roadwork equipment, farm vehicles, or horse-drawn wagons and carriages. It appears as a solid orange triangle during the day and a hollow red triangle at night.