A triangular traffic sign is a type of road sign used to indicate that drivers must YIELD the right-of-way to other vehicles or pedestrians. The sign is usually yellow and has a black border, with the word 'YIELD' written in black letters. It is used to alert drivers to slow down and be prepared to stop if necessary. The sign is often used at intersections, where one road crosses another, or at places where pedestrians have the right-of-way.