Road marking, road gang, keep clear, Health and Safety, painting road, Men at Work, trolly paint, line marking pram, following kerb line, yellow mark.
Tests are performance tests, there are no longer any tests on the composition requirements of the thermoplastic, percentage of binder or glass beads. Briefly the thermoplastic material is a mixture of a light coloured silica sand, (a bulking agent), a white pigment, (to make it look white), a resin binder, (to hold it all together), and some glass beads, (to make the lines shine in the dark by reflecting the headlight beam back to the driver). The property of the night-time visibility of a line is known as its retro-reflectivity, or sometimes specific luminance. Glass beads are also added to the still molten thermoplastic line surface to increase the initial retro-reflectivity of the line. When the line surface becomes worn, the retro-reflectivity of the line will then depend on the glass beads incorporated in the thermoplastic material becoming exposed with wear. This continuing ability of the line to reflect light to the motorist will be enhanced by the quantity and quality of the glass beads in the thermoplastic, and the whiteness of the line matrix. Also the quality of workmanship cannot be underestimated in producing road markings of high quality and good durability, and it is an unfortunate fact that you tend not to get good workmanship without good supervision. Road markings are used in many ways to convey a great deal of information to the road user to control traffic movements and provide safe road conditions, and in daylight or under street lighting the markings are relatively easy to see. However, in the dark, the retro-reflectivity of the line becomes a prime safety factor, allowing the vehicle driver to see the line of the road in front of him, as well as the information contained within the road markings. It is the desire to increase night time road safety that increased specification for minimum retro-reflectivity of white lines has been introduced. The testing of white lines for retro-reflectivity using the retrometer has been introduced
Size: 3500px × 5250px
Photo credit: © Steve Welsh / Alamy / Afripics
License: Licensed
Model Released: No
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