GMC 2002 Sierra - Manual (Page 272)

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CAUTION:
Coasting downhill in NEUTRAL (N) or with the
ignition off is dangerous. Your brakes will have
to do all the work of slowing down. They could
get so hot that they wouldn’t work well. You
would then have poor braking or even none going
down a hill. You could crash. Always have your
engine running and your vehicle in gear when
you go downhill.
D Know how to go uphill. You may want to shift
down to a lower gear. The lower gears help cool
your engine and transmission, and you can climb
the hill better.
D Stay in your own lane when driving on two - lane
roads in hills or mountains. Don’t swing wide or cut
across the center of the road. Drive at speeds that let
you stay in your own lane.
D As you go over the top of a hill, be alert. There
could be something in your lane, like a stalled car
or an accident.
D You may see highway signs on mountains that
warn of special problems. Examples are long grades,
passing or no
- passing zones, a falling rocks area
or winding roads. Be alert to these and take
appropriate action.