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raised pavement marker
A raised pavement marker is a safety device used on roads. These devices are usually made with plastic, ceramic, thermoplastic paint or occasionally metal, and come in a variety of shapes and colors. Raised reflective markers include a lens or sheeting that enhances their visibility by reflecting automotive headlights. Some other names for specific types of raised pavement markers include convex vibration lines, Botts' dots, delineators, cat's eyes, road studs, or road turtles. Sometimes they are simply referred to as reflectors.
==Convex vibration marking line==
The surface of this type of vibrating coating line is distributed and scattered with raised bumps. Some bumps are coated with high refractive index glass beads. When a speeding vehicle runs over the raised road lines, it produces a strong warning effect to remind the car driver of deviation from the lane. Perpendicular to driving directions, these marking lines are used for settled mainline toll plaza, ramp entrances, mountainous areas, continuous sharp turns, downhill sections and the end of the highway (intersection of highway exit and the plane of the common roadway), gates and entrances of enterprises, institutions and school. In the same direction of traffic driving direction, they are mainly settled in the median strip, edge lines, and dangerous sections of the road.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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