Chipseal flushing is an international problem, reducing the skid resistance of road pavements and contributing to other common pavement problems such as bleeding and bitumen tracking. In the worst cases, the chipseal texture of the pavement will be reduced to the point where the bitumen binder completely covers the surface of the pavement aggregate. But pavements will be considered flushed, and hence require resealing, at much lower rates of texture loss than this. The Transport Agency defines a flushed seal as one where the texture depth is less than 0.7mm (for roads with speed limits under 70km/h) or less than 0.9mm (for limits over 70km/h).
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