Abstract: A technique for characterizing precipitation includes receiving an impedance signal that is indicative of the impedance in a predetermined area on a measurement surface, deriving, on basis of the impedance signal, a first precipitation rate that is descriptive of accumulated mass of precipitation particles falling on the predetermined area during a calculation period, receiving an acoustic signal that is indicative of acoustic impacts caused by the precipitation particles in vicinity of the measurement surface, deriving, on basis of the acoustic signal, a second precipitation rate that is descriptive of accumulated mass of the precipitation particles during the calculation period, and designating, in response to receiving an indication regarding a presence of precipitation, current precipitation type as one of predetermined precipitation types at least in part on basis of a first precipitation indicator value derived on basis of the first and second precipitation rates.

Abstract: A technique for characterizing precipitation includes receiving an impedance signal that is indicative of the impedance in a predetermined area on a measurement surface, deriving, on basis of the impedance signal, a first precipitation rate that is descriptive of accumulated mass of precipitation particles falling on the predetermined area during a calculation period, receiving an acoustic signal that is indicative of acoustic impacts caused by the precipitation particles in vicinity of the measurement surface, deriving, on basis of the acoustic signal, a second precipitation rate that is descriptive of accumulated mass of the precipitation particles during the calculation period, and designating, in response to receiving an indication regarding a presence of precipitation, current precipitation type as one of predetermined precipitation types at least in part on basis of a first precipitation indicator value derived on basis of the first and second precipitation rates.

Abstract: The present invention relates to methods, computer software products, server and system for mapping road conditions, especially friction. In the method according to the invention the acceleration of the vehicle is measured by means of an acceleration sensor, the position of the vehicle is monitored by means of positioning means and the measured acceleration value is combined with the position data of the measurement location. The method compares whether the measured position-specific acceleration value exceeds the value on the server for the said area and in case the value is exceeded, a measured position-specific acceleration value is sent to the server.

Abstract: The present invention relates to methods, computer software products, server and system for mapping road conditions, especially friction. In the method according to the invention the acceleration of the vehicle is measured b means of an acceleration sensor, the position of the vehicle is monitored by means of positioning means and the measured acceleration value is combined with the position data of the measurement location. The method compares whether the measured position-specific acceleration value exceeds the value on the server for the said area and in case the value is exceeded, a measured position-specific acceleration value is sent to the server.

Abstract: The invention relates to a precipitation weighing gauge, comprising a frame (1), a load cell (2) mounted on the frame (1), a collector bucket (3) mounted on the load cell (2), either directly or using a separate weighing platform (18), a funnel element (5) adapted to rest on the collector bucket (3) during measurement, and a jacket (4) connected to the frame (1) and surrounding the collector bucket (3). According to the invention to the jacket (4) is mounted an orifice element (7) including a spraying device (8) for spraying liquid in order to melt ice or snow from the orifice (7), the funnel (5) or the collector bucket (3) surfaces.

Abstract: The present invention relates to a method and apparatus for measuring road surface conditions. In the method of measuring road surface conditions, the conditions prevailing on the surface of a road are measured by a sensor head mounted in the pavement of the road with the top surface of the sensor head aligned substantially flush with the pavement of the road. According to the invention, an optical signal is impinged from below the road to the top surface of the road, the reflection/backscatter of the optical signal is measured inside the pavement layer of the road, and weather/driving conditions prevailing on the road top surface are determined from the reflected and backscattered signal values.

Abstract: A method and an apparatus for determining the covering on a road surface. A measurement signal is fed into a pair of electrodes inlaid in the road surface and acting as a detector (5), whereby the ratio of the measurement current to the voltage formed across the detector (5) is determined in order to establish the conductivity of the covering on the road surface. The signal fed into the detector (5) is a low-voltage and low-frequency symmetric alternating voltage signal, and the electric polarization between the poles, caused by the measurement current, is measured in order to determine the thickness of the covering on the road surface.