Hill And Mountain Roads - GMC 2018 Acadia Denali Owner's Manual

200 Driving and Operating
wet enough and you are going fast
enough. When the vehicle is
hydroplaning, it has little or no
contact with the road.
There is no hard and fast rule about
hydroplaning. The best advice is to
slow down when the road is wet.
Other Rainy Weather Tips
Besides slowing down, other wet
weather driving tips include:
Allow extra following distance.
Pass with caution.
Keep windshield wiping
equipment in good shape.
Keep the windshield washer fluid
reservoir filled.
Have good tires with proper
tread depth. See Tires 0 291.
Turn off cruise control.
Activate All-Wheel Drive (AWD)
mode. See Driver Mode Control
0 221.

Hill and Mountain Roads

Driving on steep hills or through
mountains is different than driving
on flat or rolling terrain. Tips include:
Keep the vehicle serviced and in
good shape.
Check all fluid levels and brakes,
tires, cooling system, and
transmission.
Shift to a lower gear when going
down steep or long hills.
Warning
Using the brakes to slow the
vehicle on a long downhill slope
can cause brake overheating, can
reduce brake performance, and
could result in a loss of braking.
Shift the transmission to a lower
gear to let the engine assist the
brakes on a steep downhill slope.
Warning
Coasting downhill in N (Neutral)
or with the ignition off is
dangerous. This can cause
overheating of the brakes and
loss of steering assist. Always
have the engine running and the
vehicle in gear.
Drive at speeds that keep the
vehicle in its own lane. Do not
swing wide or cross the
center line.
Be alert on top of hills;
something could be in your lane
(e.g., stalled car, accident).
Pay attention to special road
signs (e.g., falling rocks area,
winding roads, long grades,
passing or no-passing zones)
and take appropriate action.
Select All-Wheel Drive (AWD)
Mode.
See Driver Mode Control 0 221
and All-Wheel Drive 0 215.