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  2. Road signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_the_United...

    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).

  3. Diverging diamond interchange - Wikipedia

    en.wikipedia.org/wiki/Diverging_diamond_interchange

    A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), [1] [2] is a subset of diamond interchange in which the opposing directions of travel on the non-freeway road cross each other on either side of the interchange so that traffic crossing the freeway on the overpass or underpass is operating on the ...

  4. Overpass - Wikipedia

    en.wikipedia.org/wiki/Overpass

    An overpass, called an overbridge or flyover (for a road only) in the United Kingdom and some other Commonwealth countries, is a bridge, road, railway or similar structure that is over another road or railway. An overpass and underpass together form a grade separation. [1] Stack interchanges are made up of several overpasses.

  5. Interstate Highway standards - Wikipedia

    en.wikipedia.org/wiki/Interstate_Highway_standards

    An Interstate Highway under construction , with both directions of traffic moved to one side of the roadway I-94 in Michigan, showing examples of non-interchange overpass signage in median, upcoming exit signage on right shoulder, a pre-1960 overpass with height restriction signage, newly installed cable median barrier, and parallel grooved ...

  6. Dual carriageway - Wikipedia

    en.wikipedia.org/wiki/Dual_carriageway

    A dual carriageway or a divided highway is a class of highway with carriageways for traffic travelling in opposite directions separated by a central reservation (BrE) or median (AmE). Roads with two or more carriageways which are designed to higher standards with controlled access are generally classed as motorways , freeways, etc., rather than ...

  7. Interstate Highway System - Wikipedia

    en.wikipedia.org/wiki/Interstate_Highway_System

    Locating a sign on the ground to the side of the highway, mostly the right, and is used to denote exits, as well as rest areas, motorist services such as gas and lodging, recreational sites, and freeway names; Attaching the sign to an overpass; Mounting on full gantries that bridge the entire width of the highway and often show two or more signs

  8. Controlled-access highway - Wikipedia

    en.wikipedia.org/wiki/Controlled-access_highway

    Two routes of the Trans-African Highway network cross Kenya: the Cairo-Cape Town Highway and the Lagos–Mombasa Highway. Roads in Kenya are divided into classes: Class S: "A Highway that connects two or more cities and carries safely a large volume of traffic at the highest speed of operation."

  9. Two-lane expressway - Wikipedia

    en.wikipedia.org/wiki/Two-lane_expressway

    A super-4 expressway is a multi-lane divided highway with at-grade intersections, although the highway will become a full controlled-access freeway if the intersections are replaced with interchanges. A super-4 may have been a super-2 that has been twinned, although such instances of super-4 intermediaries are rare as super-2s are often ...