Sign Shapes and Colors
Sign shapes and colors convey meaning before you can read the words. The Florida exam uses this domain to test recognition at a glance, including signs whose legend is missing or too far away to read.
Shapes
Octagon: STOP, the only octagon on the road. Inverted triangle: YIELD. Diamond: warning. Pennant (horizontal triangle): no-passing zone. Rectangle: regulatory or guide, depending on color. Pentagon: school crossing. Round: railroad advance warning. Crossbuck: railroad crossing. Trapezoid: recreational or cultural area. A square is usually regulatory.
Colors
Red means stop, yield, prohibition or danger. White with black is regulatory. Yellow warns. Orange marks construction and maintenance. Green guides with destinations and distances. Blue shows motorist services. Brown marks recreation and cultural interest. Fluorescent yellow-green marks school, pedestrian and bicycle areas. Fluorescent pink marks incident management. Purple is used on some electronic toll signs. Color also signals priority: a red legend on white is a prohibition, while a black legend on white is usually a requirement.
Worked example
An eight-sided sign is visible at an intersection but its legend is obscured. The shape alone identifies it as STOP, so you must stop. If the sign were an inverted triangle, you would slow and yield, not necessarily stop. If it were a yellow diamond, it would be a warning and you would adjust speed but not stop unless conditions require it - a common distractor.
Traps that cost marks
Do not answer from color alone; a red octagon and a red circle-with-slash both mean prohibition, but one is a stop sign. Do not call a green sign a service sign; services are blue. Do not assume a brown sign is a warning. The pennant points in the direction of the no-passing zone, and a yellow diamond with a black arrow is not a lane-use regulatory sign.