Skid resistance is the main safety-related attribute of pavement surface condition and affects the braking ability of vehicles. It can be measured by the coefficient of friction, which is the ratio of the shear force generated during slippage to the normal force between two surfaces. Several factors influence skid resistance, including vehicle speed, surface texture, condition, tire characteristics, weather, road geometry. Texture is differentiated into microtexture, which contributes to skid resistance at low speeds, and macrotexture, which governs skid resistance at higher speeds.