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This file is in the public domain because it comes from the Manual on Uniform Traffic Control Devices, sign number R1-1, which states specifically on page I-1 that: Any traffic control device design or application provision contained in this Manual shall be considered to be in the public domain .
Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs. Some have special shapes, such as the octagon for the Stop sign, the triangle for the Yield sign, and the crossbuck for railroad crossings.
Graphic design and symbological details; The use of square-bordered or circular regulatory signs; Local languages (signs may be bilingual or trilingual) Most notable is the text on stop signs. Unlike in Europe, the text on stop signs in the Americas varies depending on language, and may be multilingual.
The stop sign is retroreflective and equipped either with red blinking lights above and below the stop legend or with a legend that is illuminated by LEDs. Unlike a normal stop sign, this sign indicates a two-way absolute stop, requiring other vehicles travelling in both directions to remain stopped until the sign is retracted. [citation needed]
Mandatory signs are similar to European signs. They are circular with a red border, a white background and a black symbol. Stop sign and Yield sign are as European, except the word "Stop" is changed for "Pare" and the Yield sign has no letters; it is a red triangle with white centre. Information signs have many shapes and colours.
In the UK, positive upright signs are generally circular with a white border and symbol on a blue background. [2] In Ontario, Canada, positive signs have a green circle. [1] The colour red is used almost universally to prohibit a certain activity, however a vide variety of designs exist even for most stop signs.
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