Reduced visibility on the road can result from darkness, twilight, rain, snow, fog, smoke, and bright sunlight. When judging your speed, slow down enough to maintain a safe stopping distance. However, do not slow down so much that you are a hazard to other drivers behind you. In reduced visibility situations, drivers tend to follow the tail lights of the vehicle in front of them. If you find it necessary to pull off the road, pull off as far as you possibly can, turn off your headlights, release your foot from the brake pedal and turn on your hazard lights.
You should always have a quality pair of sunglasses in you vehicle to cope with bright conditions. When driving through fog, you must drive with your lights or low beams on. Do not drive with your high beams on; they will only reflect back off the fog ad impair your vision even further. Reduce your speed in fog, and keep your eye on your speedometer as fog can actually make it feel as if you are going slow when you are, in fact, speeding.
Listen for traffic that you cannot see. Open your window slightly to aid in hearing traffic noise.