GMC 2007 Acadia - Manual (Page 351)

Freeway Driving
Mile for mile, freeways — also called thruways,
parkways, expressways, turnpikes, or
superhighways — are the safest of all roads.
But they have their own special rules.
The most important advice on freeway driving
is: Keep up with traffic and keep to the right. Drive
at the same speed most of the other drivers are
driving. Too-fast or too-slow driving breaks a
smooth traffic flow. Treat the left lane on a freeway
as a passing lane.
At the entrance, there is usually a ramp that leads
to the freeway. If you have a clear view of the
freeway as you drive along the entrance ramp,
you should begin to check traffic. Try to determine
where you expect to blend with the flow. Try to
merge into the gap at close to the prevailing
speed. Switch on the turn signal, check the
mirrors, and glance over your shoulder as often
as necessary. Try to blend smoothly with the
traffic flow.
Once you are on the freeway, adjust your speed
to the posted limit or to the prevailing rate if it
is slower. Stay in the right lane unless you want
to pass.
Before changing lanes, check the mirrors. Then,
use the turn signal.
Just before you leave the lane, glance quickly
over your shoulder to make sure there is not
another vehicle in your blind spot.
Once you are moving on the freeway, make sure
you allow a reasonable following distance.
Expect to move slightly slower at night.
When you want to leave the freeway, move to the
proper lane well in advance. If you miss your
exit, do not, under any circumstances, stop and
back up. Drive on to the next exit.
The exit ramp can be curved, sometimes quite
sharply. The exit speed is usually posted. Reduce
your speed according to the speedometer, not
to your sense of motion. After driving for any
distance at higher speeds, you might tend to think
you are going slower than you actually are.
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