2004 GMC Envoy Owner's Manual - Page 263

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 not do. There are some hills that simply can not be driven, no matter how well built the vehicle. 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 as you near the top, but you may not see this because the crest of the hill is hidden by bushes, grass or shrubs. Here are some other things to consider as you approach a hill. • Is there a constant incline, or does the hill get {CAUTION: Many hills are simply too steep for any vehicle. If you drive up them, you will stall. If you drive down them, you can not control your speed. If you drive across them, you will roll over. You could be seriously injured or killed. If you have any doubt about the steepness, do not drive the hill. sharply steeper in places? • Is there good traction on the hillside, or will the surface cause tire slipping? • Is there a straight path up or down the hill so you will not have to make turning maneuvers? • Are there obstructions on the hill that can block your path (boulders, trees, logs or ruts)? • What is beyond the hill? Is there a cliff, an embankment, a drop-off, a fence? Get out and walk the hill if you do not know. It is the smart way to find out. Approaching a Hill When you approach a hill, you need to decide if it is one of those hills that is just too steep to climb, descend or cross. Steepness can be hard to judge. On a very small hill, for example, there may be a smooth, constant incline • Is the hill simply too rough? Steep hills often have ruts, gullies, troughs and exposed rocks because they are more susceptible to the effects of erosion. 4-21