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The marker is generally held in place using butyl pads, epoxy glue, or bitumen. [2] In areas with little snowfall, reflective raised pavement markers are applied directly on top of the road surface. The device's retroreflective surface enables the device to be clearly visible at long distances at night and in rainy weather.
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.
In California, highway lanes may be marked either solely by Botts' dots, or dots placed over painted lines. Four dots are used for broken lines on freeways, and broken lines on surface streets may use only three dots. Reflective pavement markers are placed at regular intervals between Botts' dots to increase the visibility of lane markings at ...
A single-ended form has become widely used in other colours at road margins and as lane dividers. Cat's eyes are particularly valuable in fog and are largely resistant to damage from snow ploughs . A key feature of the cat's eye is the flexible rubber dome which is occasionally deformed by the passage of traffic.
Glass beads composed of soda lime glass are essential for providing retroreflectivity in many kinds of road surface markings. [1] Retroreflectivity occurs when incident light from vehicles is refracted within glass beads that are imbedded in road surface markings and then reflected back into the driver's field of view. [ 2 ]
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