Buick 1993 LeSabre Owner's Manual page 154

Traffic Lights
Some traffic lights also use red arrows to signify that
you must stop before turning on red.
REVERSIBLE
LANE ON
LANE
ROADWAY
MULTI-
x
-. -.
We're all familiar with traffic lights or stop lights. Often
green arrows are being used in the lights for improved
traffic control. On some multilane roads, green arrows
light up, indicating that traffic in one or more lanes can
move or make a turn. Green arrows don't mean "go no
matter what." You'll still need to proceed with caution,
yielding the right of way to pedestrians and sometimes
to
other vehicles.
Many city roads and expressways, and even bridges, use
reversible-lane traffic control during rush hours. A red
X
light above a lane means no driving in that lane at that
time. A green arrow means you may dfive in that lane.
Look for the signs posted to warn drivers what hours
and days these systems are in effect.
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