Chevrolet 1993 S-10 Pickup Owner's Manual page 159

AM402009
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
PASSING ZONE. This sign will be on
two-lane roads to indicate a NO
the left side of the roadway.
. ~.~
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RECTANGULAR (square
or
oblong) signs show speed limits, parking
regulations, give directions, and such information as distances
to
cities.
4-5