1998 GMC Envoy Owner's Manual - Page 186

Your vehicle will require more frequent service due to off-road use. Refer to the Maintenance Schedule for additional information. Here are some tips on night driving. 0 0 0 Drivin at Night 0 0 Drive defensively. Don't drink and drive. Adjust your inside rearview mirror to reduce the c2 "lare from headlamps behind you. Since you can't see as well, you may need to slow down and keep more space between you and other vehicles. Slow down, especially on higher speed roads. Your headlamps can light up only so much road ahead. In remote areas, watch for animals. If you're tired. pull off the road in a safe place and rest. Night Vision N o 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 see the same thing a t night as a 20-year-old. What you do i n the daytime can also affect your night vision. For example, if you spend the day i n 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 headlamps, but they also make a lot of things invisible. Night driving is more dangerous than day driving. One reason is that some drivers are likely to be impaired -- by alcohol or drugs, with night vision problems. or by fatigue. 4-27 I