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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.
White rectangular signs with a red border indicate lane usage directions. Information and direction signs are rectangular, with a green background indicating a state highway, a blue background for all other roads and all services (except in some, where directional signage is white), and a brown background for tourist attractions.
The exact style of these signs varies widely, although many are influenced by the MUTCD standard. Chile, Ireland, Japan, and New Zealand use both white-on-green and white-on-blue guide signs, as does the Northwest Territories and Ontario in Canada. Parts of Australia use yellow-on-blue guide signs for certain road classes.
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 and the crossbuck for railroad crossings.
Other roads have green signs. Other places sometimes use blue or white signs to indicate private roads. As of 2009, the Manual on Uniform Traffic Control Devices (MUTCD) approved color schemes for street name signs including a green, blue, or brown background with white text, or a white background with black text. [2]
Usually shown as a red diagonal bar inside a blue circle with a red ring in Europe and parts of Asia, and a 'P' in a red circle with a cross through in North and South America, elsewhere in Asia, Australia, Africa and Ireland. The no parking sign is a part of controlled parking zone sign, which is obsolete in Belgrade from 1997. [citation needed]
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]
Traffic signs or road signs are signs erected at the side of or above roads to give instructions or provide information to road users. The earliest signs were simple wooden or stone milestones . Later, signs with directional arms were introduced, for example the fingerposts in the United Kingdom and their wooden counterparts in Saxony .