The combination of alcohol and drugs, in some cases, can increase the effects of both the drugs and alcohol. It can be unsafe to drive after consuming either alcohol or drugs and is even more dangerous after combining them.

You should slow down as you enter a curve and increase your speed gradually as you exit. Increasing your speed as you enter a curve will make it more difficult to control your vehicle.

It is illegal to drive so slowly that you disrupt the normal flow of traffic. You may receive a citation for driving too slowly.

After an accident, do not move the injured unnecessarily. Unskilled handling can make serious injuries out of minor ones. Keep the injured warm until skilled help arrives. If there is severe bleeding, attempt to stop the flow of blood with direct pressure.

When turning onto a street with more than one lane moving in the direction that you are traveling, turn into the lane that is closest to your previous lane. Do not change lanes when turning.

When you drive, make sure each person in your vehicle wears a seat belt. In the event of a crash, a person without a seat belt becomes a flying object and a danger to each person in the vehicle.

This sign indicates that a T intersection is ahead.

This sign warns that there is a steep hill or downgrade ahead.

This sign indicates that the road ahead turns sharply to the right and then sharply to the left.

You must yield the right-of-way to police cars, fire engines, ambulances, or any other emergency vehicles using a siren or air horn and a red or blue flashing light. Follow any instructions given over the emergency vehicles' loudspeakers. Emergency vehicles often follow each other so you should proceed only when you are certain the way is clear.

This sign indicates that a divided highway begins ahead. The road splits into two one-way roadways separated by a median or divider. You must keep to the right.

This sign indicates that right turns are prohibited. Do not make a right turn at an intersection where this sign is posted.

Arrows may be used to indicate which lanes should be used for specific purposes, such as driving straight or making a turn.

To slow down on a slippery road, you should first take your foot off the gas pedal. If you need to slow down even more, gently apply a slow, steady pressure to your brake pedal.

An ignition interlock device (IID) is a mechanical unit that is connected to the vehicle’s ignition, horn, and headlights and measures the concentration of alcohol in a person’s breath. If you have more than one alcohol-related contact showing on your driver record, you must have an IID installed on any vehicle you operate before your driving privileges can be reinstated. You must pay for having the device installed and for having it serviced every month.

A sign with a red circle and slash over a symbol indicates that the action represented by the symbol (in this example, a right turn) is not allowed.

Two solid yellow lines down the center of a two-way road mean that neither lane of traffic may cross the lines, unless they are turning off of the roadway. A driver can cross double yellow lines when turning into or out of a driveway or entrance to a business. No passing is allowed over a solid yellow line.

A flashing yellow light warns of a hazard. Slow down and proceed with caution.

Entrance ramps for highways often have acceleration lanes. When merging with traffic from an acceleration lane, you should put your signal on, look for an opening in traffic, accelerate up to the speed of traffic, and merge into an opening in traffic.

You must always yield to pedestrians who are in or about to enter a crosswalk. Be alert to pedestrians when driving across intersections or turning.

Round signs warn drivers of an upcoming railroad crossing area. Drivers should use extra caution when approaching a railroad crossing.

This sign indicates that the road that you are on intersects with a divided highway. A divided highway is two one-way roadways separated by a median or guide rail.

Warning signs prepare drivers for upcoming road conditions and hazards and are usually yellow with black markings. This sign warns drivers that they are approaching a T intersection and should prepare to turn either right or left.

A red flashing traffic signal has the same meaning as a stop sign. When approaching a red flashing signal, come to a complete stop and proceed when it is safe to do so. A stop sign may sometimes also be posted where this signal is located.

To ensure that you will have time to react to hazards on the roadway, it is best to keep a cushion of space on all sides of your vehicle. Do not crowd vehicles to your left and right sides.