Road surface friction on the Strategic Road Network (SRN) is managed through the requirement to provide skid resistance and texture depth. The requirements have been in place since the 1980s and were last reviewed prior to the 2004 update to the skid resistance Standard (HD28). Given the changes that have occurred in recent years to the SRN, including the introduction of Smart motorways and widespread adoption of negatively textured pavement surfacing materials, and to the vehicle fleet, for example anti-lock braking systems and electronic stability control systems are now widespread, a further review of the current approach was appropriate to inform a series of recommendations.

This task undertook similar analyses to those reported in TRL 622 (Parry & Viner, 2005) to examine the relationship between skid resistance, collision risk and other characteristics.

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