Mobile friction observations and thermal mapping in Testbed area Helsinki Testbed mesoscale course Toni Hellinen and Marjo Hippi
Motivations Interest of using new equipments Researching the spatial fluctuation of road temperature and friction Finding the sensitive places of road slipperiness Identification of different weather phenomena that cause slipperiness on roads
Vaisala Remote Road Surface Condition Sensor DSC111 Remote surface state sensing Measuring thickness of water ice slush snow or frost layer friction coefficient (0-1) Parallel use with remote temperature sensor Both attached to vehicle
Observations Mobile measurements from ColdSpots project data Comparable data from road weather stations in Testbed area Mobile measurements were done in interesting weather situations Thawing period Snowing period Cold slippery (surface temperature below -7 C and light snow) Slush period
Map of the area (Vt1)
Case study Vt
Radar data :30 UTC
Conclusions Research three different occasions Vt : Snowing Vt6, Vt : Thawing and snowing Vt6, Vt : Slush Comparing optical friction and temperature measurements to road weather observations and radar data