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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).
The Manual on Uniform Traffic Control Devices for Streets and Highways (usually referred to as the Manual on Uniform Traffic Control Devices, abbreviated MUTCD) is a document issued by the Federal Highway Administration (FHWA) of the United States Department of Transportation (USDOT) to specify the standards by which traffic signs, road surface markings, and signals are designed, installed ...
Height, weight, and width restrictions are almost always accompanied by units (tonnes or metres); in the US, the short ton is used with no distinction from metric tonnes. Signs in some parts of Canada and Mexico near the US border often include both metric and Imperial units, to remind US drivers that they are entering metric countries.
This is a comparison of road signs in countries and regions that speak majorly English, including major ones where it is an official language and widely understood (and as a lingua franca). Among the countries listed below, Liberia , Nigeria , and the Philippines have ratified the Vienna Convention on Road Signs and Signals , while the United ...
Road Traffic Regulation Act 1984; Vienna Convention on Road Signs and Signals; Manual on Uniform Traffic Control Devices, a comparable system in the United States; Health and Safety (Safety Signs and Signals) Regulations, similar regulations for safety signs
The inscriptions on road signs are written in Spanish since it is an official language of Puerto Rico and is most widely spoken in Puerto Rico. [ 3 ] The suffix (D) in parentheses means "right", from Spanish derecha , while the (I) in parentheses means "left", from Spanish izquierda .
Since 2016, on width and height limit signs both metric and imperial measurements are used (metres and feet & inches), however older signs still show imperial-only measurements [citation needed]. Weight limits have been expressed in metric tonnes since 1981, but signs continued to use an upper case "T" until 2011.
Overtaking is prohibited either for all vehicles or for certain kinds of vehicles only (e.g. lorries, motorcycles). In the USA, this is usually phrased as "no passing zone" and indicated by a rectangular, black-on-white sign on the right side of the road that says "DO NOT PASS", and/or by a solid yellow line painted on the roadway marking the left limit of traffic (centerline), and sometimes ...