GMC 1993 Suburban Owner's Manual page 190

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Watch for traffic signs, pavement markings, and lines. If you can see a
sign up ahead that might indicate a turn or an intersection, delay your
pass. A broken center line usually indicates it's all right to pass
(providing the road ahead is clear). Never cross a solid line on your side
of the lane or a double solid line, even i f the road seems empty of
approaching traffic.
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If you suspect that the driver of the vehicle you want to pass isn't aware
of your presence, tap the horn a couple of times before passing.
Do not get too close to the vehicle you want to pass while you're
awaiting an opportunity. For one thing,. following too closely reduces your
area of vision, especially if you're following a larger vehicle. Also, you
won't have adequate space i f the vehicle ahead suddenly slows or stops.
Keep back a reasonable distance.
When
it looks
like a chance to pass is coming up, start
to
accelerate
but stay in the right lane and don't get too close. Time your move so
you will be increasing speed as the time comes
to
move into the other
lane. If the way is clear to pass, you will have a "running start'' that
more than makes up for the distance you would lose by dropping back.
And if something happens to cause you to cancel your pass, you need
only slow down and drop back again and wait for another opportunity.
If other cars are lined up to pass a slow vehicle, wait your turn. But
take care that someone isn't trying to pass you as you pull out to pass
the slow vehicle. Remember to glance over your shoulder and check the
blind spot.
Check your mirrors, glance over your shoulder, and start your left lane
change signal before moving out of the right lane to pass. When you
are far enough ahead of the passed vehicle to see its front in your
inside mirror, activate your right lane change signal and move back into
the right lane. (Remember that your right outside mirror is convex. The
vehicle you just passed may seem to be farther away from you than it
really is).
Try not to pass more than one vehicle at a time on two-lane roads.
Reconsider before passing the next vehicle.
Don't overtake a slowly moving vehicle too rapidly. Even though the
brake lights are not flashing,
it
may be slowing down or starting to turn.
If you're being passed, make it easy for the following driver to get ahead
of you. Perhaps you can ease a
little
to the right.
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