Buick RIVIERA 1993 Manual page 146

' 1
A DIAMOND-shaped
sign is a
warning of
something ahead - for
example, a curve, steep
hill, soft shoulder, or a
narrow bridge.
A TRIANGLE, pointed
downward, indicates
YIELD. It assigns the
right-of-way to traffic on
certain approaches to an
intersection.
.
A TRIANGULAR sign
also is used..on two-lane
roads to indicate
a
NO
PASSING ZONE. This
sign will be on the left
side of the roadway.
't
u
KEEP
RIGHT
LEFT OR
THROUGH
[
ONLY
j
RIGHT TURN
ONLY
RECTANGULAR (square or oblong) signs show speed
limits, parking regulations, give directions, and such
information as distances to cities.