Maintenance activities affecting slipperiness include drainage repair, snow removal and street sweeping. Even a small increase in slipperiness of a section of road can increase the accident rate of the section of road tenfold. Public works agencies spend a sizeable portion of their budget measuring and reducing road slipperiness. Road slipperiness can be measured either in terms of the friction between a freely-spinning wheel and the ground, or the braking distance of a braking vehicle, and is related to the coefficient of friction between the tyre and the road surface. It is a result of snow, ice, water, loose material and the texture of the road surface on the traction produced by the wheels of a vehicle. Road slipperiness is a condition of low skid resistance due to insufficient road friction. A surface friction tester, used to measure road slipperiness
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