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Mandatory signs are road signs that are used to set the obligations of all traffic that uses a specific area of road. Most mandatory road signs are circular in shape and may use white symbols on a blue background with a white border, or black symbols on a white background with a red border, although the latter is also associated with prohibitory signs.
Shape and colour of sign types Sign type [1] Meaning Colour (per ISO 3864-4) [7] Shape [7] Example Prohibition sign: Must not do: Red: Circle with diagonal line: No open flame Mandatory sign: Must do: Blue: Circle: Use hearing protection Warning sign: Warn of hazard: Yellow: Equilateral triangle with rounded corners: Explosive materials Safe ...
11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).
Examples of ISO 3864 'multiple signs' layouts A multi-message sign for hazard and mandatory action, in a vertical format A multi-message sign, with hazard, prohibition and mandatory action, in a horizontal format.
English: An example of an ISO 7010 horizontal multi-message safety sign design, that includes a Warning, prohibited, mandatory symbol and 'supplementary sign' for a text message. The order, number of symbol/supplemental signs and type presented may vary as needed.
Mandatory action signs in the Americas tend to be influenced by both systems. Nearly all countries in the Americas use yellow diamond warning signs . Recognizing the differences in standards across Europe and the Americas, the Vienna convention considers these types of signs an acceptable alternative to the triangular warning sign. [ 2 ]
Regulatory traffic signs within the United States must comply with the federal Manual on Uniform Traffic Control Devices (MUTCD) or the State MUTCD, depending on the state in which the sign is installed. These signs typically have a white background with black or red legends (legends include text, symbols, graphics not part of the background ...
No left turn. Regulatory signs “give a direction that must be obeyed.” [1] Often these signs show a content or action that is either mandatory or prohibited and these two modes are signified by colour (i.e. blue and red), orientation (i.e. a filled circle and an open circle with a diagonal line through the centre) and/or shape (i.e. a square and triangle).