Sweden has a long tradition in road surface condition monitoring. There are two measures that have dominated the estimation of the road surface condition; namely rut depth and IRI (International Roughness Index). Rut depth is the estimate of unevenness in the transverse and IRI in the longitudinal direction of the road. Deformation or wear that shows up as rut depth are common in Sweden. One big reason is that there is a law to use winter tyres (usually studded) during the winter season. Yet another reason is the actual loads that are transported. To detect differences in wear origin certain specifications is needed to be fulfilled in the design of the monitoring device. This report will deal with findings and conclusions made from years of experience in Sweden. The organized road surface monitoring scheme started in the end of 1970: s. The result is stored in the Swedish PMS (Pavement Management System). Almost all paved roads maintained by the government have been monitored every year. In this paper the result is focused on 10 years of data from one of the seven regions in Sweden. The length of measured roads in this region, Mälardalen is approximately 3000 km per year. A mean transverse profile is stored every 20 meter of measured road. Each profile is estimated from 17 sensors.