Longitudinal profile – profile unevenness is used to assess riding quality for
the road user. It measures deviations away from a moving datum which
represents an average profile along the highway
Rutting – HRM records the average rut depth to the nearside and offside
wheelpaths
Macrotexture – this is the coarser element of the surfacing, formed either by
the aggregate particles in the surfacing or grooves in the concrete surface. It
contributes to skidding resistance, particularly at high speeds, mainly by
providing drainage paths for the water
Alignment parameters – gradient, crossfall and radius of curvature measurements are estimated to an accuracy of ±10%