GMC 2001 Envoy - Manual (Page 236)

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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 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.
D Is there a constant incline, or does the hill get
sharply steeper in places?
D Is there good traction on the hillside, or will the
surface cause tire slipping?
D Is there a straight path up or down the hill so you
won’t have to make turning maneuvers?
D Are there obstructions on the hill that can block
your path (boulders, trees, logs or ruts)?
D What’s beyond the hill? Is there a cliff, an embankment,
a drop - off, a fence? Get out and walk the hill if you
don’t know. It’s the smart way to find out.
D 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.
Driving Uphill
Once you decide you can safely drive up the hill,
you need to take some special steps.
D Use a low gear and get a firm grip on the
steering wheel.
D Get a smooth start up the hill and try to maintain
your speed. Don’t use more power than you need,
because you don’t want your wheels to start spinning
or sliding.
D Try to drive straight up the hill if at all possible.
If the path twists and turns, you might want to find
another route.
CAUTION:
Turning or driving across steep hills can be
dangerous. You could lose traction, slide sideways,
and possibly roll over. You could be seriously
injured or killed. When driving up hills, always
try to go straight up.