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|The examples and perspective in this article deal primarily with the English-speaking world and do not represent a worldwide view of the subject. (January 2012)|
In road transport, a yield (Canada, Ireland, South Africa, South Korea and the United States) or give way (United Kingdom, other Commonwealth and English-speaking countries) traffic sign indicates that each driver must prepare to stop if necessary to let a driver on another approach proceed. A driver who stops has yielded the right of way to another. In contrast, a stop sign requires each driver to stop completely before proceeding, even if no other traffic is present. Particular regulations regarding appearance, installation, and compliance with the signs vary by jurisdiction.
A black triangle (within the standard down-arrow-shape of stop signs) was a symbol of "stop for all vehicles" since about 1925 in Germany. The triangular yield sign was used as early as 1938 when it was codified in Czechoslovakia in a blue-white variant without words and in 1939 in the Protectorate of Bohemia and Moravia which adopted the current red-white variant. In the United States, the first yield sign was installed in 1950 at First Street and Columbia Avenue Tulsa, Oklahoma, having been devised and designed (apparently independently) by Tulsa police officer Clinton Riggs.  Riggs invented only the sign, not the rule, which was already in place. The sign as originally conceived by Officer Riggs was shaped like a keystone; later versions bore the shape of an inverted equilateral triangle in common use today.
"...if engineering judgment indicates that one or more of the following conditions exist:
The sign went through several changes from its original design to the sign used today. Originally invented in 1952, the sign used the "keystone" shape, before adopting the more readily recognized triangular shape. In 1972, the sign evolved into its modern version and changed from yellow to red.
By contrast, the United Kingdom's Road Traffic Act calls for give way signs and road markings far more often at junctions (intersections) where stop signs would be used in the US. The road marking accompanying the sign consists of a large inverted triangle painted just before the place to give way.
In Wales, the signs bear bilingual legends; the Welsh ildiwch appears above give way.
In the United Kingdom, a stop or give-way sign may be preceded by an inverted, blank, triangular sign with an advisory placard such as give way 100 yards. In most other parts of Europe, the sign at the intersection itself is also blank.
In Australia, the Give Way sign experienced a similar evolution as its counterpart in the United States. During the 1940s and 1950s, the sign was circular and yellow. During the 1970s, the sign changed to the triangular shape and red. In the 1980s the sign adopted its modern design and gained a counterpart for use at roundabouts.
In New Zealand, the original design also used the keystone shape as in the United States, but used a black background with a red border. In the 1980s, the modern design was adopted.
In the Republic of Ireland, the sign reads yield in most areas, though in Gaeltacht (Irish language-speaking) areas, it reads géill slí ("Give Way") instead. Signs erected before 1997 and still in service read yield right of way. Use of the sign is similar to that of the UK.
Modern design in Gaeilge
In Brazil, the "Yield" sign has the same shape and colors of the American sign, but with nothing written within. Brazilians call it as "Dê a preferência" ("Give the preference").
Thailand uses a sign of the same shape and colors, containing the Thai phrase "give way."
Give Way to Main Road
Yield at Roundabout
Cyclists must Yield
Yield to Pedestrians
New York City
Jamaica (Australia formerly)
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