Yellow diamond-shaped signs are used to warn drivers of potential hazards or changes in road conditions.
A red octagon-shaped sign always means "Stop." Drivers must come to a complete stop at the line or crosswalk and then proceed when it's safe.
A green circular signal indicates that drivers may proceed through the intersection if it is clear and safe.
A "Yield" sign means you must slow down and yield the right-of-way to any vehicles or pedestrians in or approaching the intersection.
