Stop Sign
Octagonal red traffic sign requiring vehicles to come to a complete stop.
International · 1915 – present
Triangular traffic sign requiring drivers to yield right-of-way.
The yield sign (known as 'give way' in many countries) is a regulatory traffic sign requiring drivers to slow down and yield the right-of-way to traffic in the intersection or road they are entering. The inverted triangle shape is internationally standardized. In most countries, the sign is red and white (or red and yellow). The Vienna Convention on Road Signs and Signals specifies the inverted triangle as the shape for yield signs, distinguishing them from warning signs (upright triangles).
Yield signs were introduced in the United States in 1950 in Tulsa, Oklahoma. The inverted triangle was standardized internationally by the Vienna Convention in 1968.