GMC 2006 Sierra 1500 Pickup Owner's Manual page 336

•
Attach a flag to the vehicle to make you more visible
to approaching traffic on trails or hills.
•
Sound the horn as you approach the top of the hill to
let opposing traffic know you are there.
•
Use your headlamps even during the day.
They make you more visible to oncoming traffic.
CAUTION:
{
Driving to the top (crest) of a hill at full speed
can cause an accident. There could be a
drop-off, embankment, cliff, or even another
vehicle. You could be seriously injured or killed.
As you near the top of a hill, slow down and
stay alert.
4-24
Q:
What should I do if my vehicle stalls, or is about
to stall, and I cannot make it up the hill?
A:
If this happens, there are some things you should
do, and there are some things you must not do.
First, here is what you should do:
•
Push the brake pedal to stop the vehicle and keep
it from rolling backwards. Also, apply the parking
brake.
•
If the engine is still running, shift the transmission to
REVERSE (R), release the parking brake, and slowly
back down the hill in REVERSE (R).