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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.
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.
white-on-blue for both (): employed in the Netherlands. white-on-green for both (): employed in China and Sweden. Local traffic road signs usually employ black text on white. Exceptions are the Czech Republic (yellow-on-black), Finland (white-on-black), Austria and Spain (white-on-green), as well as Denmark, Iceland and Poland (blue-on-white).
Almost all prohibitory signs use a red circle with a slash. Restrictive signs typically use a red circle, as in Europe. Some may be seated on a rectangular white background. The original MUTCD prohibitory and restrictive signs were text-only (i.e. NO LEFT TURN). [14] Some of these signs continue to be used in the US.
An unusual occurrence of the rectangular arrow sign appears on the eastbound approach to Dead Man's Curve in Cleveland, Ohio, US, a curve so sharp that in places an arrow's stem is printed on one sign and the arrow's point is printed on another larger sign further down the road; from the driver's perspective at a distance, the two signs ...
All signals use white lighting and special symbols ("S", "–" and an arrow) to distinguish them from regular signals. The small light at the top tells the driver when the vehicle's transponder signal is received by the traffic light. In traffic engineering, there are regional and national variations in traffic light operation. This may be in ...
In many European countries the dark background with light coloured text version of the sign is intended for information only. [16] Poland uses white text on a green background (E-17a/E18a) to show the political boundary of a place as information and uses the black on white pictogram version (D-42/D-43) to designate the change of traffic rules. [17]
Default colour scheme is black text on white background, although the Queen Elizabeth Way uses blue "QEW" on gold, and provincially-maintained toll highways (407, 412 and 418) use white route numbers on blue. These shields used to be emblazoned with "The King's Highway" across the top, but the wording has been removed since the 1990s.