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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.
In the Las Vegas area of southern Nevada, roads with multiple lanes use four pavement markers for each broken white line, a reflective marker followed by three Botts' dots. Botts' dots are used extensively in Hawaii. Most state-owned roads and many arterial roads in the state use Botts' dots as the delineation between lanes.
28 in (711 mm), 10 lb (4.5 kg) – for freeway/highway applications (with reflective stripes) 36 in (914 mm), 10 lb (4.5 kg) – for freeway/highway applications (with reflective stripes) In New Zealand, they are compliant in two sizes for use on all roads; these are: 35 in (900mm), up to 16.5 lb (7 kg) - for all activities on all roads.
In colder climates, reflective markers may be installed below ground using an elongated narrow triangle, cut into the road surface that allows the device to be installed below the road surface. Newer technology allows these to be placed above ground with snowplough-able rails that attempt to protect the reflective components from the snowplow ...
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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]
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