A traffic beacon is a single flashing light hung over an intersection or placed over signs or on obstacles in the road.
Flashing red beacon
A flashing red beacon above an intersection or stop sign means you must come to a complete stop. Move through the intersection only when it is safe to do so.
Flashing yellow beacon
A flashing yellow beacon above an intersection, above a warning sign or on an obstruction in the road, warns you to drive with caution.