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

Even if a vehicle is properly equipped with rearview and outside mirrors, it still has blind spots that cannot be seen in the mirrors. Large trucks have much larger blind spots than most passenger vehicles.

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.

Before changing lanes, check for drivers trying to pass you who may be trying to enter the same lane as you. Look over your shoulder to check your blind spot. You should never attempt to pass or otherwise change lanes in an intersection.

Drivers must use their turn signals before changing lanes or making a turn. Drivers traveling at high speeds should signal four to five seconds before moving to the left or right.

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

Warning signs are usually yellow with black markings. They alert you to conditions that are immediately ahead. This sign warns drivers about the presence of traffic signals at an intersection ahead.

Airbags are important safety devices that provide protection in crashes. For best protection, a vehicle's lap and shoulder belts should be used in combination with airbags.

Factors affecting a person's absorption of alcohol include the person's weight, their biological sex, the amount of food in their digestive tract, and the number of alcoholic beverages they have consumed. The only thing to do to remove alcohol from a person's system is to wait.

Warning signs are usually yellow with black markings. They alert you to conditions that are immediately ahead. These signs may be accompanied by speed advisory plaques that indicate the speed with which you should proceed.

Always set your parking brake when you park. Leave the vehicle in gear if it has a manual transmission or in “Park” if it has an automatic transmission.

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.

Use low beam headlights when driving in rain, snow, sleet, or fog. High beam headlights in adverse weather conditions lower visibility by reflecting off the precipitation and back into the driver's eyes.

Slow down and proceed with caution if you see animals that are standing near the roadway. They may unexpectedly bolt or change direction at the last moment. Some animals travel in packs, so there may be more animals just out of sight that are also near the road.

You should adjust your speed to travel smoothly with the other traffic on a roadway (provided that the other traffic is driving within the posted speed limits). Remember that vehicles moving in the same direction at the same speed cannot hit each other. Crashes involving multiple vehicles often happen when some vehicles are traveling at different speeds than others.

Yellow lines separate traffic moving in opposite directions. Dashed lines on the pavement indicate that passing is permitted when safe.

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.

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.

Pentagonal signs mean you are approaching a school zone and/or school crossing. When you see these signs, be alert and prepare to stop.

When a protected turn arrow changes from green to yellow, drivers must prepare to yield to oncoming traffic. A yellow arrow indicates that the protected left turn is ending.

All temporary signs in work zones have orange backgrounds with black writing and/or symbols.

Certain offenses committed while driving will count against a driver in South Dakota's system of suspending driver licenses. If a driver accrues 15 points or more within a 12-month period, their license will be suspended. Lengths of suspension vary based on how many offenses the driver has committed.

This sign warns that two lanes of traffic going the same direction will soon merge into one lane.

This sign is displayed on slow-moving vehicles.

You must have evidence of financial responsibility, such as proof of insurance, with you whenever you drive. You must always show proof of insurance and your license to an officer upon request after a traffic stop or collision.