This sign warns of two-way traffic.

By definition, blind spots are areas that cannot be seen using your mirrors. To check your blind spots, you should look over your shoulders.

The speed at which you should drive your vehicle depends on road conditions, the weather, and the legal speed limit. You may never drive above the legal speed limit. Decrease your speed when anything makes conditions less than ideal.

Where this sign is posted, it is prohibited to make a right turn. It would be unsafe and unlawful to make a right turn at an intersection with this sign.

Before changing lanes, signal, look in all your mirrors, and look over your left or right shoulder to make sure the lane next to you is clear. Looking over your shoulder is a way to check your blind spot to be sure there is no vehicle, motorcycle, or bicycle traffic in the next lane.

When traffic permits, you should make room to allow vehicles to merge into your lane.

This sign warns that a steep downgrade is ahead on the road. Drivers should check their brakes.

If an oncoming driver fails to dim their high beams, you should avoid looking directly at the headlights. Instead, look toward the right edge of your lane and watch the oncoming vehicle out of the corner of your eye.

Orange-colored signs indicate construction areas. Proceed with caution.

Even after a train passes, watch out for a second train approaching on any track. Do not proceed until all gates have been lifted and all warning signals have stopped flashing.

When changing lanes, glance over your shoulder to check for traffic in your blind spot. You may need to look several times before changing lanes. You must keep track of what traffic is doing in front of you as well as what traffic is doing in the lane next to you.

An octagonal (eight-sided) sign always means "Stop." Come to a complete stop, yield to traffic and pedestrians that have the right-of-way, and proceed when the way is clear.

It is illegal to drive under the influence of any substance that impairs your ability to drive safely. This includes alcohol, prescription medications, over-the-counter medications, and illegal drugs.

You may not stop, stand, or park at a red-painted curb.

Make room for vehicles that are entering a freeway. If possible, merge into the next lane to create a gap for the incoming vehicles. If you cannot merge, adjust your speed to allow for the vehicles to enter traffic as smoothly and safely as possible.

With decreased visibility and the glare of oncoming headlights, you cannot see as far ahead at night as you can during the day. Always use headlights and exercise caution when driving in the dark.

When passing another vehicle on its left, you may move back into the right lane when the headlights of the passed vehicle can be seen in your rearview mirror. Always signal before changing lanes.

If a tire blows out or suddenly goes flat while you are driving, grip the steering wheel firmly and keep the vehicle aiming straight. Take your foot off the accelerator and do not brake. Allow the vehicle to slow by itself and use the brakes gently, but only if necessary. Pull off the road when it is safe to do so.

If you come across a "No passing zone" sign, it is not legal to pass in the indicated area. You are likely driving in an area with restricted visibility where it would be unsafe to pass another vehicle.

A broken yellow line alongside a solid yellow line means that traffic in the lane next to the broken line may cross the line to pass, while traffic in the lane next to the solid line may not.

When encountering a flashing yellow light at an intersection, you should slow down and proceed with caution. You do not need to come to a complete stop when approaching a flashing yellow light.

Warning signs are usually yellow with black markings. This sign indicates that a divided highway is beginning and cars should keep to the right.

A wet, slippery road does not allow your tires the traction they need, so it is necessary to drive more slowly on a wet road than you would on a dry road. To reduce the risk of skidding, you should avoid fast turns or stops.

If your vehicle leaves the roadway, hold the steering wheel firmly, release the gas pedal, and gently apply the brakes. Wait until your speed has reduced, check the traffic, and look for a place to safely return to the roadway by merging back into traffic. Overcompensating by jerking the wheel to return to the roadway can cause you to lose control of your vehicle or may cause your car to go into other lanes of traffic.

When driving during unfavorable weather conditions, avoid slamming on the brakes and making sharp, quick turns. These behaviors will make controlling your vehicle in inclement weather even more difficult.

A double solid yellow line down the center of a road indicates that traffic is moving in opposite directions and that passing is not allowed from either direction.

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.

The only way to remove the effects of alcohol from the body is to let time pass. Eating, drinking coffee, or taking a shower will not speed up this process.

Drivers must obey any instructions given by a police officer, even if the instructions contradict laws, signs, signals, or markings that would otherwise apply.

Blood alcohol concentration (BAC) is a measure of the percentage of alcohol in a person's blood. The higher the BAC, the more impaired a person is.

Because they are larger, trucks take longer to stop than cars traveling at the same speed. Other drivers should not pull in front of a truck and then slow down or stop.

This orange warning sign tells drivers that an area of roadwork is upcoming. When traveling through a work zone, stay alert for temporary traffic control devices.

The only way to sober up after drinking alcohol is to allow time for your body to eliminate the alcohol in your system. Nothing you can do, including eating and drinking, can accelerate this process.

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.

When passing, you should not return to your original lane until you can see both headlights of the passed vehicle in your rearview mirror. Always check your blind spots before moving back into your original lane.

Collisions are more likely to happen when one driver moves faster or slower than the other vehicles on the road. Driving faster than other traffic increases your chance of being involved in a collision. Driving more slowly than other traffic is also dangerous because it can increase the risk of a rear-end collision with your vehicle or cause other drivers to swerve to avoid hitting you.

When the center of the road is marked by a solid yellow line beside a broken yellow line, passing is permitted from the side next to the broken line and prohibited from the side next to the solid line.

If your vehicle becomes disabled, you must (if possible) park with all four wheels off of the main-traveled portion of the road.

Excessive speed is one of the most common contributing factors to vehicle crashes. Excessive speed does not save time and often leads to high-risk decision-making.

You must stop at a railroad crossing when directed to do so by a flagger, stop sign, or warning signal. Use caution when driving near railroad tracks.