Highway Hypnosis; Hill And Mountain Roads - GMC 2010 Yukon XL Denali Owner's Manual

Highway Hypnosis

Always be alert and pay attention to your surroundings
while driving. If you become tired or sleepy, find a safe
place to park your vehicle and rest.
Other driving tips include:
Keep the vehicle well ventilated.
Keep interior temperature cool.
Keep your eyes moving
and to the sides.
Check the rearview mirror and vehicle instruments
often.
5-26
scan the road ahead

Hill and Mountain Roads

Driving on steep hills or through mountains is different
than driving on flat or rolling terrain. Tips for driving in
these conditions include:
Keep the vehicle serviced and in good shape.
Check all fluid levels and brakes, tires, cooling
system, and transmission.
Going down steep or long hills, shift to a
lower gear.
WARNING:
If you do not shift down, the brakes could get so
hot that they would not work well. You would then
have poor braking or even none going down a hill.
You could crash. Shift down to let the engine
assist the brakes on a steep downhill slope.