2009 Hummer H3T Owner's Manual - Page 201

Driving Your Vehicle Scanning the Terrain Off-road driving can take you over many different kinds of terrain. Be familiar with the terrain and its many different features. Surface Conditions: Off-roading surfaces can be hard-packed dirt, gravel, rocks, grass, sand, mud, snow, or ice. Each of these surfaces affects the vehicle's steering, acceleration, and braking in different ways. Depending on the surface, slipping, sliding, wheel spinning, delayed acceleration, poor traction, and longer braking distances can occur. Surface Obstacles: Unseen or hidden obstacles can be hazardous. A rock, log, hole, rut, or bump can startle you if you are not prepared for them. Often these obstacles are hidden by grass, bushes, snow, or even the rise and fall of the terrain itself. Some things to consider: 4-19 • Is the path ahead clear? • Will the surface texture change abruptly up ahead? • Does the travel take you uphill or downhill? Off-roading requires a different kind of alertness from driving on paved roads and highways. There are no road signs, posted speed limits, or signal lights. Use good judgment about what is safe and what is not. • Will you have to stop suddenly or change direction quickly? When driving over obstacles or rough terrain, keep a firm grip on the steering wheel. Ruts, troughs, or other surface features can jerk the wheel out of your hands. When driving over bumps, rocks, or other obstacles, the wheels can leave the ground. If this happens, even with one or two wheels, you cannot control the vehicle as well or at all. Because you will be on an unpaved surface, it is especially important to avoid sudden acceleration, sudden turns, or sudden braking. Crossing Obstacles Approach Angle - a Key to Mobility If you encounter a large dip in the terrain, do not enter straight on; enter at an angle - 15° minimum approach (A), 75° maximum approach angle (B).