Every 0.02 percent increase in blood alcohol concentration nearly doubles a driver's risk of being in a fatal crash.

When a steady yellow light appears on a traffic signal, you should prepare to stop. If you are already within the intersection, you should clear the intersection as quickly as possible.

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

This sign indicates parking spaces that are reserved for vehicles displaying Persons with Disabilities license plates, Disabled Veteran license plates, and/or disabled parking placards.

To prevent skidding on slippery surfaces, you should shift to a low gear before going down a steep hill. You should also follow farther behind the vehicle in front of you than you normally would. Quick stops should be avoided. Unless you have antilock brakes, pump the brakes to slow or stop.

Yellow lines separate lanes of traffic moving in opposite directions. A broken yellow line next to your driving lane means that you may pass.

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.

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.

Before beginning a right turn, use the appropriate signal to give surrounding drivers adequate notice of your intentions. Slow down and approach the intersection from the right lane, staying as close as is practical to the right curb or edge of the roadway.

Adjust your inside rearview mirror so you can see the entire rear window from the driver's seat. You should have to move only your eyes, not your head, when using this mirror.

Certain offenses committed while driving will count against a driver in South Dakota's system of suspending driver licenses. If a driver accrues 22 points or more within a 24-month period, their license will be suspended. Lengths of suspension vary based on how many offenses the driver has committed.

You should avoid passing other vehicles on two-lane roads. Every time you pass a vehicle, your odds of being in a collision increase.

When approaching a school bus that is picking up or dropping off passengers, you must come to a complete stop before reaching the bus, regardless of your direction of travel.

At a stop sign, you must come to a full stop and check for traffic in all directions before proceeding.

Use high beam headlights only when driving in rural areas and when other cars are not nearby. Lower your headlights to their low beam setting when you are following closely behind another driver.

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 intersection so they may prepare for potential traffic or prepare to turn.

Driving above the speed limit, driving too far below the speed limit, and driving too fast for conditions are all actions that commonly contribute to traffic accidents. Always drive with the general flow of traffic, within legal speed limits.

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.

Before you return to your driving lane, be sure you are not dangerously close to the vehicle you have just passed. One way to do this is to look for the vehicle in your inside rearview mirror. When you can see both headlights in your rearview mirror, you may have enough room to return to your driving lane.

Night driving creates a unique set of problems for drivers. Due to the reduced visibility, it can be difficult to judge distance and the traveling speeds of other vehicles when driving at night. Drivers can see only as far as their headlights allow.

If two vehicles arrive at the same time to an intersection that has stop signs on all corners, the vehicle to the right has the right-of-way.

Reserved handicap parking spaces should be used only by persons with a disability as defined under state law. To park in a handicap parking space, you must have either the appropriate license plate or designated hang tag displaying the international symbol.

When driving too quickly in wet conditions, your tires may lose all contact with the road surface. Loss of traction will cause the vehicle to ride on top of the water, which is called "hydroplaning." The best way to prevent this from happening is to drive more slowly in rainy or wet conditions than you would when driving during ideal weather conditions.

If you pass on the right, do so only when conditions permit you to do so legally and safely. You may only drive on the shoulder of a road if an official has directed you to do so.

You may never drive off the paved or main-traveled portion of the road and onto the shoulder to pass another vehicle.