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Most warning signs are diamond-shaped and yellow or red-bordered triangular warning signs; some warning signs may be fluorescent yellow-green in order to draw extra attention. There are a few exceptions to this: Pentagonal signs are used in school zones in the United States, Liberia, and many areas in Canada.
Various color schemes for mandatory signs. See image description page for large image and legend. The design of mandatory signs varies widely, since the MUTCD does not specify their use. [1] Rather, the MUTCD's equivalent are classified as regulatory signs. Some countries use simple arrows with the text "ONLY" or its equivalent underneath.
The 11th edition of the MUTCD was released on December 19, 2023. [1] The effective date, 30 days after publication, of the MUTCD was January 18, 2024. States have two years after the effective date to do one of the following options: adopt the revised MUTCD, adopt the revised MUTCD with a state supplement, or adopt a state-specific MUTCD.
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.
Roads can be motorways, expressways or other routes. In many countries, expressways share the same colour as primary routes, but there are some exceptions where they share the colour of motorways (Austria, Liechtenstein, Hungary, Switzerland, Spain, Sweden) or have their own colour (the countries comprising former Yugoslavia employ white text on blue specifically for expressways).
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 ...
Example of an original U.S. Route shield, with the state name of "Michigan" and route number of "27" displayed in the original block font. The original design of the shield was presented in the January 1927 edition of the Manual and Specifications for the Manufacture, Display, and Erection of U.S. Standard Road Markers and Signs, the precursor to the Manual on Uniform Traffic Control Devices ...
English: A guide sign on Interstate 19 in Arizona. Built in the 1980s, when the United States was considering switching the the metric system. The sign is posted Tucson AZ, warning drivers that the Interstate uses metric measurement on guide signs. (Font used is Series D, sign not to scale.)