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  2. Pavement condition index - Wikipedia

    en.wikipedia.org/wiki/Pavement_Condition_Index

    The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]

  3. Solar road stud - Wikipedia

    en.wikipedia.org/wiki/Solar_road_stud

    Solar road stud. Solar road studs are flashing solar cell powered LED low-maintenance lighting devices that delineate road edges and centrelines. Embedded in the road surface, they are an electronic improvement on the traditional cat's eyes [1] and raised pavement marker in that they may give drivers a larger reaction window.

  4. Road surface marking - Wikipedia

    en.wikipedia.org/wiki/Road_surface_marking

    The paint and tape markers can cause the road surface to crack, and in more severe cases, the markers contribute to road surface raveling [22] (a process in which the aggregate particles are dislodged from the road surface, causing the surface texture to become deeply pitted and very rough [23]) or potholes.

  5. Raised pavement marker - Wikipedia

    en.wikipedia.org/wiki/Raised_pavement_marker

    The orange markers separate opposing traffic lanes. The blue marker denotes a fire hydrant on the left sidewalk. A raised pavement marker is a safety device used on roads. These devices are usually made with plastic, ceramic, thermoplastic paint, glass or occasionally metal, and come in a variety of shapes and colors.

  6. International roughness index - Wikipedia

    en.wikipedia.org/wiki/International_roughness_index

    A smooth road with low IRI usually has a high PCI. However, this is not always the case, and a road with low IRI could have a low PCI too and vice versa. [5] [20] Therefore, one of these performance indicators is not necessarily enough to describe the road condition comprehensively. It is reported that the prediction of future IRI values may be ...

  7. Highway engineering - Wikipedia

    en.wikipedia.org/wiki/Highway_engineering

    Highway engineering (also known as roadway engineering and street engineering) is a professional engineering discipline branching from the civil engineering subdiscipline of transportation engineering that involves the planning, design, construction, operation, and maintenance of roads, highways, streets, bridges, and tunnels to ensure safe and effective transportation of people and goods.

  8. Cat's eye (road) - Wikipedia

    en.wikipedia.org/wiki/Cat's_eye_(road)

    Double-ended cat's eye is Shaw's original design and marks road centre-line. The inventor of cat's eyes was Percy Shaw of Boothtown, Halifax, West Yorkshire, England.When the tram-lines were removed in the nearby suburb of Ambler Thorn, he realised that he had been using the polished steel rails to navigate at night. [3]

  9. Botts' dots - Wikipedia

    en.wikipedia.org/wiki/Botts'_dots

    Today, there are more than 25 million Botts' dots in use in California, [6] though they have started falling out of favor. In 2017, Caltrans announced that it would stop using Botts' dots as the sole indicator of lane division, due to cost and worker safety, and in order to make roadways more compatible with self-driving cars.