Buick 1993 LeSabre Owner's Manual page 179

If you are on a three-lane freeway, treat the right lane as
the slower-speed through lane, the middle lane as the
higher-speed through lane, and the left lane
as
the
passing lane.
Before changing lanes, check your rearview mirrors.
Then use your turn signal.
Just before you leave the lane, glance quickly over your
shoulder to make sure there isn't another vehicle in your
"blind" spot.
If you are moving from an outside to a center lane on a
freeway having more than two lanes, make sure another
vehicle isn't about to move into the same spot. Look at
the vehicles two lanes over and watch for telltale signs:
turn signals flashing, an increase in speed, or moving
toward the edge of the lane. Be prepared to delay your
move.
Once you are moving on the freeway, make certain you
allow a reasonable following distance. Expect to move
slightly slower at night.
Leaving the Freeway
When you want to leave the freeway, move to the proper
lane well in advance. Dashing across lanes at the last
minute is dangerous. If you miss your exit do not, under
any circumstances, stop and back up. Drive on to the
next exit.
AI
each exit point is a deceleration lane. Ideally it
should be long enough for you to enter it at freeway
speed (after signaling, of course) and then do your
braking before moving onto the exit ramp.
Unfortunately, not all deceleration lanes are long enough
-- some are too short for all the braking. Decide when to
start braking. If you must brake on the through lane, and
if there is traffic close behind you, you can allow a little
extra time and flash your brake lights (in addition to
your turn signal) as extra warning that you are about to
slow down and exit.
The exit ramp can be curved, sometimes quite sharply.
I
ne exit speed is usually posted. Reduce your speed
according to your speedometer, not to your sense of
motion. After driving for any distance at higher speeds,
you may tend to think you are going slower than you
actually are. For example, 40 mph (65 km/h) might
seem like only 20 mph (30 km/h). Obviously, this could
lead to serious trouble on a ramp designed for 20 mph
(30 km/h)!
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