To determine a safe driving speed, you must take into account many factors, including road conditions, visibility, and the flow of other traffic. When conditions are less than perfect, safety may require you to drive more slowly than the posted speed limit.

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

To turn left from multilane streets and highways, start from the left lane.

If you must drive in foggy conditions, you should use your low beam headlights, as well as your fog lights, if your vehicle has them. High beams direct their light upwards, where it can bounce off the fog and into your eyes, reducing visibility even more.

To complete a turn safely, you should activate your turn signal three to four seconds before your turn.

Hydroplaning happens when a vehicle glides on top of a thin layer of water between its tires and the road. Tires with low air pressure or bad tread can increase the risk of hydroplaning. Speeding also increases the risk.

It is illegal in Pennsylvania for anyone under the age of 21 to buy or consume alcohol, have it in their possession, or have it in a vehicle that they are driving. Even if you are not driving, your driving privileges can be suspended if you are convicted of one of several alcohol-related offenses, including transporting alcohol.

Your horn should be used as a warning in situations where you think another driver or a pedestrian does not see you. For example, if a child begins to run into the street in front of your vehicle, you should sound your horn.

You may pass on the right when the driver ahead of you is making or signaling a left turn, provided that you stay on the berm or shoulder. You may also pass on the right when you are on a roadway with two or more marked traffic lanes in each direction.

A large truck has large blind spots to the front, sides, and rear of the vehicle. Avoid lingering in these areas. Because of their larger size and weight, trucks require more room to maneuver and stop than passenger vehicles.

On slippery roads, you should increase your following distance. It may take more time to stop your vehicle than it would under normal conditions.

Chevron signs like this indicate that the road curves sharply in the direction indicated by the chevron (in this case, to the left). There may be several chevron signs placed throughout a curve.

Warning signs prepare drivers for upcoming road conditions and hazards and are usually yellow with black markings. This sign alerts drivers to an upcoming curve in the road.

Blind spots are areas that a driver cannot see without moving their head. They can be located to the sides of and behind a vehicle.

State law requires you to use your headlights any time you cannot see pedestrians or other vehicles on the highway for a distance of 1,000 feet ahead of your vehicle.

The most important thing to remember about driving in curves is that your vehicle’s inertia may make it difficult to turn. To maintain control, it is essential that you slow down before entering the curve.

The faster you drive on a wet roadway, the less effective your tires will be at wiping the water from the road. If your speed becomes excessive enough, your tires will lose their grip on the road entirely and you will begin to hydroplane (that is, to slide down the road on a film of water).

If you are following another vehicle at a railroad crossing, check to make sure you have enough room to get all the way across before you drive onto the tracks. You should never try to pass another vehicle as you approach or cross a railroad crossing. Always check for trains before crossing any railroad tracks.