1994 GMC Suburban Owner's Manual - Page 175

When you drive over bumps, rocks, or other obstacles,your wheels can leave the ground. If this happens, even with one or two wheels, you can't control the vehicle as well or at all. Because you will be on an unpaved surface, it's especially important to avoid sudden acceleration, sudden turns, or sudden braking. In a way, off-road driving requires a different kind of alertness from driving on paved roads and highways. There are no road signs, posted speed limits or signal lights. You have to use your own good judgment about what is safe and what isn't. Drinking and driving can be very dangerous on any road. And this is certainly true for off-road driving. At the very time you need special alertness and driving skills, your reflexes, perceptions and judgment can be affected by even a small amount of alcohol. You could have a serious- or even fatal - accident if you drink and drive or ride with a driver who has been drinking. (See "Drunken Driving" in the Index.) Driving On Off-Road Hills Off-road driving often takes you up, down, or across a hill. Driving safely on hills requires good judgment and an understanding of what your vehicle can and can't do. Thereare some hills that simply can't be driven, no matter how well built the vehicle. Approaching a Hill When you approach a hill, you need to decide if it's one of those hills that's just too steep to climb, descend, or cross. Steepness be hard to judge. can On a very small hill, for example, there may be a smooth, constant incline with only a small change in elevation where you can easily see all the way to the top. On a large hill, the incline may get steeper asyou near the top, but you may not see this because the crest of the hill is hidden by bushes, grass, or shrubs. 4-15