Road slipperiness
（重定向自Skid resistance）
![A surface friction tester, used to measure road slipperiness](/Images/godic/202502/11/Surface_Friction_Tester1336.jpg")
![Dutch newsreel about the anti-skid training school of Rob Slotemaker](/Images/godic/202502/11/-Anti_slip_geheimen_van_R._Slotemaker-523070.ogv1336.jpg")
Road slipperiness (low skid resistance due to insufficient road friction) is the technical term for the cumulative effects 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 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.