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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).
A Prussian milestone c. 1836, reading "II MEILEN BIS BERLIN" ("two miles to Berlin").. The first direction signs were milestones on the Roman road network; finding one's location on the long, straight roads was difficult, and hence, large stones were placed at intervals along the roads, giving the distance in Roman miles to nearby major cities, and usually to the capitals of major provinces.
The Uniform Vehicle Code (UVC) is a model act by the National Committee on Uniform Traffic Laws and Ordinances, a private non-profit organization. Most of the members are state governments, in addition to some related organizations. The extent to which the code is used varies by each state, territory, and Native American tribe. It was last ...
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At four-legged intersections within Europe, a roundabout or mini-roundabout may be used to assign a relative priority to each approach. (Roundabouts remain rare in North America, where early failures of rotaries and traffic circles caused such designs to lose favor until the gradual introduction of the modern roundabout in the late 20th century.)
Swiss mountain postal road sign: priority given to public transport, such as postal bus (pay special attention to the specific three-tone-horn of the postal bus approaching hairpin bends and wait before the bend; traffic users must follow instructions given by public transport drivers)
A roundabout interchange is a type of interchange between a controlled access highway, such as a motorway or freeway, and a minor road. The slip roads to and from the motorway carriageways converge at a single roundabout , which is grade-separated from the motorway lanes with bridges.