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Road marking paint used to be specified based on SABS Standard 731. This standard was, however, completely revised and a new standard published in 1995. The latter standard, SABS, no longer is a road marking paint standard, but is a road marking standard. Although this seems to be a small difference, in practice this means a major deviation from the previous standard.
SABS 731-1 now also contains traffic wear requirements. The traffic wear index is a requirement that estimates the extent to which the road marking has been worn away. It gives an indication of the daytime visibility of the road marking and is based on an a ssessment of the remaining paint cover on a specific surface area. After the application of a rating and weighting procedure, the tester is left with an aggregate value called the Traffic Wear Index. The larger the index, the greater the degree of wear.
This test method is based on a procedure in use in the United Kingdom and is more fully described in SABS Method 1248.
The nighttime visibility is measured directly by means of a portable field retro-reflectometer. The test is fully described in SABS Method 1261: 1999 and measures the Co-efficient of Retro-reflectance (RL30m) (as the ratio of the retro-reflected light (that which reaches the driver's eye) to the light falling on to unit area of road marking using a stand ard illuminant. The measurement is made in millicandelas per lux per square metre (mcd/lx/m2). The values so measured are particularly sensitive for different angles of incident and reflected light. Worldwide standardisation has been achieved to measure in accordance with the so-called 3 0m-geometry.
Zhengzhou Dayu Machinery Co., Ltd. is a leading road marking equipments manufacturer and supplier in China. Dayu road marking machines include many different types, such as dy-ssal driving type cold paint road marking machine, dy-hal-iii hand push cold paint road marking machine etc. Dayu also supply road marking paints and glass beads, dayu road marking materials include dayu thermoplastic screeding road marking paint, dayu thermoplastic spraying road marking paint, etc.
Know more details about Dayu company: http://www.dyroad.com/about-us.html
Road marking machine manufacturer, Dayu company organized website: http://www.dyroad.com
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