When entering a roundabout, you must yield to pedestrians, bicyclists, and traffic already in the roundabout.

When driving in fog, you should slow down and use your low beam headlights. If the fog is so bad that you cannot see, pull off the road and wait for the fog to clear.

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.

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 flashing yellow light means that you should slow down, check for cross traffic, and proceed with caution.

If you start to feel tired while driving, drive to the first available rest stop or service area to take a break, nap, stretch, or change drivers. You should not rely on caffeine pills or energy drinks, as these are not a replacement for rest and may make your driving even more dangerous.

For drivers age 21 or older, it is illegal to operate a motor vehicle with a blood alcohol concentration (BAC) of 0.08 percent or higher. Driving while under the influence of alcohol is not only illegal, but dangerous.

When turning right, you should slow down and activate your turn signal before making the turn. Be careful not to turn too wide for your lane, as this may interfere with traffic.

If you are driving a motor vehicle in South Dakota, you automatically consent to a test determining the presence of alcohol, or any other abused controlled substance, in your blood. If you refuse to submit to the test, your driving privileges will be suspended.

Orange, diamond-shaped signs are used to mark construction, maintenance, survey, and utility work areas. These signs help direct drivers and pedestrians safely through dangerous zones. Fines for traffic convictions may double in areas marked by these signs.

Other drivers cannot see you unless they are looking your way. Your horn may get their attention. Use it whenever it will help prevent a collision.

If you try to insert your vehicle between a turning truck or bus and a curb, you may suffer a serious crash. To avoid a collision, do not turn until the truck or bus has completed its turn.

A truck's blind spots are much larger than a smaller car’s blind spots. The driver cannot see your car behind their vehicle and you can't see what’s happening in traffic ahead if you're driving too closely behind the truck. Whether you are driving behind or to the side of the truck, if you can’t see the driver’s face in their side view mirror, then they can’t see you.

Regulatory signs provide notice to road users of traffic laws that must be obeyed. This particular sign tells you the maximum speed limit for the stretch of highway where it is posted. You may drive more slowly than the posted speed limit, based on road conditions, but it is illegal to drive any faster than the posted speed limit.

You must never turn around while on or near any curve or hill. You may not be able to see oncoming traffic or pedestrians and may cause a collision.

Before you enter an intersection, look to both the left and right for approaching vehicles or crossing pedestrians. Look to your left a second time, as vehicle approaching from your left will be closer than those approaching from your right. Look across the intersection before you start to move to make sure the path is clear all the way through.

Legal prescription and over-the-counter drugs can impair your ability to drive, including drugs taken for colds, hay fever, allergies, or to calm nerves or muscles. It is illegal to drive while under the influence of any drug that impairs your ability to drive safely; this law does not differentiate between illegal, prescription, or over-the-counter drugs.

Never attempt to drive on a flooded road. Even if the water looks shallow, it may hide many kinds of hazards. If you encounter a flooded area, turn around and seek another route to your destination.

Warning signs are usually yellow with black markings. These signs alert drivers to areas where bicycles may be crossing.

When stopping your vehicle on the roadway, first check your mirrors for traffic. Be aware of surrounding drivers as you release the accelerator and allow your vehicle to slow. Move your foot to the brake pedal and press with steady pressure for a smooth stop.

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

There are many areas where you cannot park. You should not park within 15 feet of a fire hydrant.

An octagonal sign always means stop. When approaching a stop sign, you must come to a complete stop at the marked stop line and proceed only when it is safe to do so. If there is no stop line, stop before the crosswalk. If there is no crosswalk, stop before the intersection at a point from which you can see any oncoming traffic.

Warning signs are usually yellow with black markings. They alert you to conditions that are immediately ahead. This sign warns drivers about an upcoming winding road.

When turning left, you should slow down and activate your turn signal before making the turn. Be careful not to cut the corner short, as this may interfere with traffic.