GMC Yukon 2007 Owner's Manual page 382

Scanning the Terrain
Off-road driving can take you over many different
kinds of terrain. You need to be familiar with
the terrain and its many different features.
Here are some things to consider.
Surface Conditions: Off-roading can take you
over hard-packed dirt, gravel, rocks, grass, sand,
mud, snow, or ice. Each of these surfaces
affects the steering, acceleration, and braking of
your vehicle in different ways. Depending upon the
kind of surface you are on, you may experience
slipping, sliding, wheel spinning, delayed
acceleration, poor traction, and longer braking
distances.
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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. Here are some things to consider:
•
Is the path ahead clear?
•
Will the surface texture change abruptly up
ahead?
•
Does the travel take you uphill or downhill?
There is more discussion of these subjects
later.
•
Will you have to stop suddenly or change
direction quickly?
When you drive 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 if you are not prepared.
When you drive 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.