"Road markings are usually applied as either a cement-based paint or as 'thermoplastic' markings. Thermoplastic markings have advantages over paint, but are slightly more expensive. Tyres can soon scrub away cement paint markings, whereas thermoplastic markings have a longer life because they grip the surface better. They also remain slightly raised for longer, making them easier to see and providing better grip for vehicles.Thermoplastic road markings have a longer lifetime and tend to fade more effectively leaving roads safer for longer, they are designed to fade from the outside in so the shape of the sign will be distinguishable even during the process of it fading away."
SOURCE(http://www.safeoptions.co.uk/buyers-guide/road-and-car-park-markings-signage.htm)
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