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.

Downward-facing triangular signs mean drivers must yield. When approaching a yield sign, slow down to a speed that is reasonable for existing conditions and stop if necessary. If you must stop, do so at a marked stop line, if it exists.

A 16- or 17-year-old driver must have the written consent of a parent/legal guardian to obtain a driver license. The parent/legal guardian who gave initial consent may cancel the minor’s license at any time, for any reason, until the driver turns 18.

Warning signs provide notice to road users of a situation that might not be readily apparent and are usually yellow with black markings. This warning sign tells drivers to be alert to an intersecting side road ahead.

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.

When a school bus is stopped on the road ahead with its lights flashing and its stop arm extended, you must come to a complete stop and wait to proceed until the lights have stopped flashing and the stop arm is withdrawn. Even after the bus begins to move again, do not proceed until you are sure there are no children crossing the road ahead of you.

Warning signs are usually yellow with black markings. This sign warns drivers about an upcoming steep hill. Drivers should slow down and be ready to control their speed and protect their brakes from damage.

When facing a green light, you must yield to pedestrians and vehicles already in the intersection. Drivers must yield to pedestrians when turning on a steady green signal.

A "Merging lanes" sign indicates that two lanes of traffic going the same direction will soon merge into one lane. Drivers should be ready to either change lanes or allow other traffic to merge into their lane.

This sign warns a driver of a change in direction or a narrowing of the road. A driver may find several of these signs on the outside of a sharp curve or on approaches to a narrow bridge.

When following a motorcyclist, allow for at least a three- to four-second following distance. Motorcycles can stop quickly and following them too closely endangers your life and that of the motorcyclist. If the motorcyclist should fall, you need extra distance to avoid the rider. The chances of a fall are greatest on wet and icy roads, gravel roads, and metal surfaces such as bridges, gratings, and streetcar or railroad tracks.

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.

The stop sign is the only eight-sided sign you will see on any roadway. When you encounter a stop sign, you must come to a complete stop. You may not proceed until the way is clear for you to completely and safely pass through the intersection.

This sign prohibits drivers from making a U-turn. You cannot turn around to go in the opposite direction at an intersection where this sign is posted.

Blind or partially blind pedestrians may carry a white cane or use the assistance of a guide dog. You must yield the right-of-way to a pedestrian with a guide dog or a white cane.

This sign warns of a reverse curve in which the road curves to the right, then to the left.

To avoid contributing to chronic traffic congestion, you should not "rubberneck." That is, you should not slow down to look at out-of-the-ordinary things.

It is illegal for anyone to operate a motor vehicle on Illinois highways with any trace of a controlled drug, substance, or intoxicating compound in the blood. Drivers under age 21 will have their driving privileges suspended for three months if they are found to have had any trace of alcohol in their system after being stopped and issued a citation for a traffic violation.

Warning signs are usually yellow with black markings. They alert you to conditions that are immediately ahead. There may be an upcoming change in traffic direction, a steep downgrade, or another potentially hazardous situation that requires action on the part of the driver.

You may turn left onto a one-way street that moves to the left if there is no sign prohibiting the turn. You may not turn left onto a one-way street where traffic moves to the right.

Never pass within intersections or at other intersecting points, such as parking lot entrances and alleyways. Any time your view is blocked by a curve or a hill, you should stay in your lane and assume that there is an oncoming vehicle just out of sight. Wherever signs and/or pavement markings permit passing other vehicles, you will have to determine whether or not you have enough space to pass in a safe manner.

This sign alerts you to the possibility of traffic merging into the main stream of travel. After checking to your side and rear, you should move into another lane, if possible, to allow merging motorists a clear path.

Children are often the least predictable pedestrians and the most difficult pedestrians to see. Take extra care to look out for children, especially near schools, bus stops, playgrounds, parks, and ice cream trucks. Be aware of children riding bikes on the sidewalk, as they may come onto the road unexpectedly.

If it feels like your tires have lost contact with the surface of the road, you should ease your foot off the gas pedal and stay off the brakes. Do not try to stop or turn until your tires are gripping the road again.

A driver or passenger may not open doors on the side of a vehicle on which traffic is moving unless it can be done safely and without interfering with traffic. The door may remain open only long enough to load or unload passengers.

When passing is permitted, look for both headlights of the passed vehicle in your rearview mirror. Only then may you safely return to your original lane.

Warning signs are usually yellow with black markings. This sign warns drivers that the upcoming road will curve right, followed by a curve to the left. Drivers should adjust their speed to safely continue on the road.

To prevent hydroplaning, lower your speed in response to wet roads and keep your tires in good condition. If you detect a loss of control, take your foot off the gas, do not apply the brakes, maintain the direction of the vehicle, and allow the vehicle to slow to a manageable speed.

A downward-facing triangular sign is always a yield sign. Drivers must be prepared to slow down or stop when approaching a yield sign.

Illinois law prohibits the use of handheld cellphones, texting, or using other electronic communications while operating a motor vehicle. Hands-free devices or Bluetooth technology is allowed for persons age 19 and older.

In dry conditions, motorcycles can stop more quickly than cars. Therefore, a driver behind a motorcycle should allow at least three to four seconds of following distance so that the motorcyclist has time to maneuver in an emergency.

Some warning signs have a fluorescent yellow-green background. These signs warn of upcoming conditions, including roads with curves and sharp turns.

Slow vehicles must use the right-hand lane, except when passing or making a left turn.

Drivers should dim their headlights when following all vehicles, including motorcycles. Always dim your headlights when following a truck at night.

Driving defensively means anticipating potential errors made by others and preparing to compensate for their mistakes.