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  2. Geometric design of roads - Wikipedia

    en.wikipedia.org/wiki/Geometric_design_of_roads

    Line of sight for corner sight distance is to be determined from a 3 and 1/2-foot eye height at the vehicle driver's location on the minor road to a 4 and 1/4-foot object height in the center of the approaching lane of the major road.

  3. 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 ...

  4. Clearance (civil engineering) - Wikipedia

    en.wikipedia.org/wiki/Clearance_(civil_engineering)

    In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.

  5. Wheelbase - Wikipedia

    en.wikipedia.org/wiki/Wheelbase

    where is the force on the front tires, is the force on the rear tires, is the distance from the CM to the rear wheels, is the distance from the CM to the front wheels, is the wheelbase, is the mass of the vehicle, is the acceleration of gravity (approx. 9.8 m/s 2), is the height of the CM above the ground, is the acceleration (or deceleration ...

  6. Median strip - Wikipedia

    en.wikipedia.org/wiki/Median_strip

    Typical left-hand motorway road layout in Ireland and South Africa Divided median strip on a boulevard in Huizhou, China. A median strip, central reservation, roadway median, or traffic median is the reserved area that separates opposing lanes of traffic on divided roadways such as divided highways, dual carriageways, freeways, and motorways.

  7. Turnstile - Wikipedia

    en.wikipedia.org/wiki/Turnstile

    The full-height turnstile – a larger version of the waist-high turnstile, commonly 7 feet (2.1 m) high – is based on the same principle as the revolving door. Furthermore, full-height turnstiles offer better security inasmuch as they can neither be climbed over nor ducked under, and can be designed to lock after each person enters such that ...

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  9. Elevated highway - Wikipedia

    en.wikipedia.org/wiki/Elevated_highway

    Engineering of paving, exit orientation, turn radius, drainage, curb height, ramp length, speed optimization, shoulders, maintenance procedures, noise abatement, and minimizing the "highway wall" effect that could divide communities, were all improved in the 1940s through 1970s, partially by examining the deficiencies of this early elevated ...

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