Quality control of surfacings and condition surveys of roads

PTM measurements – Important information about the surface condition of roads

Unevenness in the longitudinal profile of the road affects vehicle vibration and passenger comfort. Great surface unevenness accelerates vehicle wear, causes vibration damage to surrounding structures and accelerates damage to the road’s surfacing and structure. Transverse unevenness or grooves cause a risk of aquaplaning. Furthermore, over time water standing in the grooves damages the surfacing and structure. The road also dries less efficiently when water flows along the grooves, with large amounts of water collecting in the wrong places.

The road’s longitudinal and transverse profiles are the most significant factors affecting driving comfort and safety. Destia has at its disposal Finland’s widest and most modern range of equipment for studying profile measurements (PTM).

The most common parameters are: groove depth, unevenness or IRI, side sloping and roughness or texture. Other information obtainable from profile data includes groove depth left and right (wheel groove), hilliness and curvature.

Destia is the Nordic countries and Finland’s largest provider of information on the grooves and evenness of the surfaced road network. Every year we analyse about 40,000 km in Finland, 30,000 km in Sweden and 20,000 km in Azerbaijan.