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  2. Cat's eye (road) - Wikipedia

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

    On the edge of the road next to the median strip, a yellow cat's eye is placed every 10 metres (33 ft). On the road shoulders a red shining cat's eye is placed every 10 metres (33 ft). On roadways separated by double yellow lines, a yellow cat's eye is placed inside the double yellow lines every 10 metres (33 ft).

  3. International roughness index - Wikipedia

    en.wikipedia.org/wiki/International_roughness_index

    Roughness progression for a road in Texas, US. Blue dots show the times of maintenance. The international roughness index (IRI) is the roughness index most commonly obtained from measured longitudinal road profiles. It is calculated using a quarter-car vehicle math model, whose response is accumulated to yield a roughness index with units of ...

  4. Threaded rod - Wikipedia

    en.wikipedia.org/wiki/Threaded_rod

    For studs that are not completely threaded, there are two types of studs: full-bodied studs, and undercut studs. Full-bodied studs have a shank equal to the major diameter of the thread. Undercut studs have a shank equal to the pitch diameter of the screw thread. Undercut studs are designed to better distribute axial stresses. In a full-bodied ...

  5. Raised pavement marker - Wikipedia

    en.wikipedia.org/wiki/Raised_pavement_marker

    Side view of a glass road stud. Glass road studs have a very special shape: the upper half is a dome shape, and the lower half is a base covered with a reflective layer. They come in a variety of colors and sizes to meet the requirements of different applications. Currently they are widely adopted in Taiwan. [citation needed]

  6. Road surface marking - Wikipedia

    en.wikipedia.org/wiki/Road_surface_marking

    The color of road studs differs according to their location. Those defining the division between lanes are white, red road studs are placed along the hard shoulder of motorways, dual carriageways and other roads to mark the left-hand edge of a running lane; and orange road studs are placed along the edge of the central reservation. Green road ...

  7. AASHO Road Test - Wikipedia

    en.wikipedia.org/wiki/AASHO_Road_Test

    The AASHO road test was to study the performance of pavement structures of known thickness under moving loads of known magnitude and frequency. [ citation needed ] The study was carried out from August 1956 to November 30, 1960 in Ottawa, Illinois [ 2 ] and has been used as a primary source of experimental data when vehicle wear to highways is ...

  8. California bearing ratio - Wikipedia

    en.wikipedia.org/wiki/California_bearing_ratio

    The CBR test is a penetration test in which a standard piston, with a diameter of 50 mm (1.969 in), is used to penetrate the soil at a standard rate of 1.25 mm/minute. Although the force increases with the depth of penetration, in most cases, it does not increase as quickly as it does for the standard crushed rock, so the ratio decreases.

  9. Wheel stud - Wikipedia

    en.wikipedia.org/wiki/Wheel_stud

    Wheel hub with disc brake and 5 wheel studs. Wheel studs are the threaded fasteners that hold on the wheels of many automobiles. They are semi-permanently mounted directly to the vehicle hub, usually through the brake drum or brake disk. Lug nuts are fastened onto the wheel stud to secure the wheel. When a wheel is removed for tire changes etc ...