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  2. Controlled-access highway - Wikipedia

    en.wikipedia.org/wiki/Controlled-access_highway

    On the controlled-access highway, opposing directions of travel are generally separated by a median strip or central reservation containing a traffic barrier or grass. Elimination of conflicts with other directions of traffic dramatically improves safety, [2] while increasing traffic capacity and speed.

  3. Opposite lock - Wikipedia

    en.wikipedia.org/wiki/Opposite_lock

    The terms "opposite lock" and "counter-steering" refer to the position of the steering wheel during the maneuver, which is turned in the opposite direction to that of the bend. The technique works best on loose or wet surfaces where the friction between the tires and the road is not too high, but can also be used on asphalt or other surfaces ...

  4. Road signs in the United States - Wikipedia

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

    Some signs can be localized, such as No Parking, and some are found only in state and local jurisdictions, as they are based on state or local laws, such as New York City's "Don't Block the Box" signs. These signs are in the R series of signs in the MUTCD and typically in the R series in most state supplements or state MUTCDs.

  5. Geometric design of roads - Wikipedia

    en.wikipedia.org/wiki/Geometric_design_of_roads

    Sag vertical curves are those that have a tangent slope at the end of the curve that is higher than that of the beginning of the curve. When driving on a road, a sag curve would appear as a valley, with the vehicle first going downhill before reaching the bottom of the curve and continuing uphill or level.

  6. List of bridge types - Wikipedia

    en.wikipedia.org/wiki/List_of_bridge_types

    Cable-stayed bridge and Suspension bridge: 1,408 m (4,619 ft) Yavuz Sultan Selim Bridge, [2] Istanbul: Cantilever bridge: 549 m (Quebec bridge) 1042.6 m (Forth Bridge) Cantilever spar cable-stayed bridge: Clapper bridge: Covered bridge: Girder bridge: Continuous span girder bridge Integral bridge: Extradosed bridge: 1,920 m Arrah–Chhapra ...

  7. 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 ...

  8. Left- and right-hand traffic - Wikipedia

    en.wikipedia.org/wiki/Left-_and_right-hand_traffic

    This is an accepted version of this page This is the latest accepted revision, reviewed on 22 February 2025. Directionality of traffic flow by jurisdiction Countries by direction of road traffic, c. 2020 Left-hand traffic Right-hand traffic No data Left-hand traffic (LHT) and right-hand traffic (RHT) are the practices, in bidirectional traffic, of keeping to the left side or to the right side ...

  9. List of steepest gradients on adhesion railways - Wikipedia

    en.wikipedia.org/wiki/List_of_steepest_gradients...

    System's ruling gradient of 7.0% is located on the viaduct connecting the Steel Bridge with Southwest 1st Avenue. [13] [14] SacRT light rail, Sacramento, California, United States 1 in 15 (6.67%) Usui Pass, former Shin'etsu Main Line, Japan: Former Keihan Keishin Line: Toden Arakawa Line (Tokyo Sakura Tram), Japan: 1 in 15.4 (6.5%)