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  2. Concrete step barrier - Wikipedia

    en.wikipedia.org/wiki/Concrete_step_barrier

    The concrete step barrier in the under construction M8 motorway in Ireland (August 2008). With effect from January 2005 and based primarily on safety grounds, the UK National Highways policy is that all new motorway schemes are to use high-containment concrete barriers in the central reserve.

  3. Traffic barrier - Wikipedia

    en.wikipedia.org/wiki/Traffic_barrier

    An early concrete barrier design was developed by the New Jersey State Highway Department. This led to the term Jersey barrier being used as a generic term, although technically it applies to a specific shape of concrete barrier. Other types include constant-slope barriers, concrete step barriers, and F-shape barriers.

  4. Jersey barrier - Wikipedia

    en.wikipedia.org/wiki/Jersey_barrier

    The F-shape is generally similar to the Jersey barrier in appearance, but is taller, with somewhat different angles. [8] The UK equivalent is the concrete step barrier. [citation needed] First tested in 1968 by the then Department of Highways in Ontario, Canada, the Ontario Tall Wall is a variant of the Jersey barrier. [10]

  5. Median strip - Wikipedia

    en.wikipedia.org/wiki/Median_strip

    With effect from January 2005 and based primarily on safety grounds, the UK's Highways Agency's policy is that all new motorway schemes are to use high containment concrete step barriers in the median (central reservation). All existing motorways will introduce concrete barriers as part of ongoing upgrades and through replacement as and when ...

  6. Concrete barrier - Wikipedia

    en.wikipedia.org/wiki/Concrete_barrier

    Concrete step barrier; Constant-slope barrier; F-Shape barrier; Jersey barrier This page was last edited on 28 December 2019, at 03:31 (UTC). Text is available ...

  7. Alkali–silica reaction - Wikipedia

    en.wikipedia.org/wiki/Alkali–silica_reaction

    ASTM C1293: "Test Method for Concrete Aggregates by Determination of Length Change of Concrete Due to Alkali-Silica Reaction". It is a long-term confirmation test (1 or 2 years) at 38 °C in a water-saturated moist atmosphere (inside a thermostated oven) with concrete prisms containing the aggregates to be characterised mixed with a high-alkali ...

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  9. Road collision types - Wikipedia

    en.wikipedia.org/wiki/Road_collision_types

    Median barriers can be divided into three basic categories: rigid barrier systems, semi-rigid barrier systems, and flexible barrier systems. Rigid barrier systems are made up of concrete and are the most common barrier type in use today [7] (e.g. Jersey barrier or concrete step barrier). They are the most costly to install, but have relatively ...

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