1993 Buick LeSabre Owner's Manual - Page 151

Shape of Road Signs The shape of the sign will tellyou something, too. ~~ -I i SWIMMING I I CANOEING BROWN signs point out recreation areas or points of historic or cultural interest. ST0 P 7 An OCTAGONAL (eight-sided) sign means STOP.It is always red with white letters. A A DIAMOND-shaped sign is a warning of something ahead-for example, a curve, steep hill, soft shoulder, or a narrow bridge. 149