Dense fog can form almost anywhere in the US, drastically reducing visibility to a quarter mile or less. This makes driving hazardous, sometimes causing multi-car pile-ups. It's best to be prepared. Here's how to drive in dense fog. Slow down. With visibility reduced, it's important to allow for increased reaction times and not rush. Keep a larger distance between yourself and other motorists, especially if the road is wet. You may be tempted to drive more closely to the car in front of you to keep it in sight, but this can increase your risk of collision. Turn on your low beam headlamps. High beams can cause light to reflect back-off water droplets in the air, further obscuring your view. If your vehicle has fog lights, turn them on. They further illuminate the road when it's foggy and make you more visible to other cars. Always use your windshield wipers and defrosters in fog to help you see and reduce glare from oncoming vehicles. Roll down your window so you can hear what's happening around you when your visibility is reduced. If you hear any suspicious noises like squealing or crunching, safely break and pull to the side of the road. When visibility is reduced, use the white line on the right hand side of the road to guide you. This is safer than using the center line, which will bring you closer to oncoming traffic. If visibility is reduced, the point where continuing to drive would be unsafe, you might be tempted to stop on the road, but don't. This could cause an accident. Instead, pull over to a safe area completely off the road. Then, turn on your emergency flashers or hazard lights so other drivers know you're parked and don't try to follow you. Avoid using your hazard lights when moving, however, because this is illegal in many states. So please remember, while driving in dense fog, slow down, use your low beams and fog lights. Turn on your windshield wipers and defrosters. Roll down your windows and follow the right side pavement line. And if it's too difficult to see, pull over and turn on your emergency flashers. Stay safe and for more extreme weather driving tips, watch the next video.