1994 GMC Suburban Owner's Manual - Page 184

Night Vision No one can see as well at night as in the daytime.But as we get older these differences increase. A 50-year-old driver may require at least twice as much light to seethe same thing at night as a 20-year-old. What you do in the daytime can also affect your night vision. For example, if you spend the day in bright sunshine you are wise to wear sunglasses. Your eyes will have less trouble adjusting to night. But if you're driving, don't wear sunglasses at night. They may cut down on glare from headlights, but they also make a lot of things invisible. You can be temporarily blinded by approaching lights. It can take a second or two, oreven several secoCds, for your eyes to readjust to the dark. When you are faced with severe glare(as from a driver who doesn't lower the high beams, or a vehicle with misaimed headlights), slow down a little. Avoid staring directlyinto the approaching lights. Keep your windshield and all the glass on your vehicle clean - inside and out. Glare at night is made much worse by dirt on the glass. Even the inside of the glass can build up a filmcaused by dust. Dirty glass makes lights dazzle and flash more than clean glass would, making the pupils of your eyes contractrepeatedly. Remember that your headlights light up far less of a roadway when you are in a turn or curve. Keep your eyes moving; that way, it's easier topick out dimly lighted objects. Just as your headlights should be checked regularly for proper aim, so should your eyes beexamined regularly. Some drivers suffer from night blindness - the inability to see in dim light - and aren't even aware of it. Driving in the Rain Rain and wet roads can mean driving trouble. On a wet road you can't stop, accelerate or turn as well because your tire-to-road traction isn't as good as on dry roads. And, if your tires don't have much tread left, you'll get even 4-24