Mobile friction observations and thermal mapping in Testbed
area Helsinki Testbed mesoscale course Toni Hellinen and Marjo
Hippi
Slide 2
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
Slide 3
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
Slide 4
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
Slide 5
Map of the area (Vt1)
Slide 6
Case study Vt1 23.1.2007
Slide 7
Radar data 23.1.2007 15:30 UTC
Slide 8
Conclusions Research three different occasions Vt1 23.1.2007:
Snowing Vt6, Vt7 26.1.2007: Thawing and snowing Vt6, Vt7 27.1.2007:
Slush Comparing optical friction and temperature measurements to
road weather observations and radar data