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VIKING Monitoring-Workshop Hamburg 2007

VIKING Monitoring-Workshop Hamburg 2007. Use of Data on Road and Weather Conditions for slippery warning Ralf Meschede/Horst Badelt. Ice warning systems for the winter maintenance:. Objective: preventive winter service call-outs. Time: at least 90 minutes before the road becomes icy.

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VIKING Monitoring-Workshop Hamburg 2007

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  1. VIKING Monitoring-WorkshopHamburg 2007 Use of Data on Road and Weather Conditions for slippery warning Ralf Meschede/Horst Badelt

  2. Ice warning systems for the winter maintenance: • Objective: preventive winter service call-outs • Time: at least 90 minutes before the road becomes icy • Place: where icy roads occurred frequent and particularly earlier than in the neighbouring network Ralf Meschede/Horst Badelt

  3. Ice-warning systems suffer from the same old weaknesses: • Ice-warning systems collect data from only one single tiny point of a road or a road network. • The warnings are actually limited to black ice or white frost without additional meteorological information. • The suppliers of such systems don’t disclose the algorithms for generating an ice-warning from the measured data. Ralf Meschede/Horst Badelt

  4. The model generates four reports: • No risk of icy roadway • Icy roadway possible if the trend changes • Icy roadway soon possible owing to the trend • Icy roadway immediately possible Ralf Meschede/Horst Badelt

  5. Roadway surface temperature >5°C 5°C Difference between roadway surface temperature and dew point temperature > 0 K  0 K Air temperature Difference between roadway surface temperature and dew point temperature Roadway surface temperature Roadway surface temperature  2°C > 2°C  3°C > 3°C > 2 K  2 K Difference between roadway surface temperature and dew point temperature in 90 minutes linear trend extrapolation from values of the last 10 minutes Difference between roadway surface temperature and dew point temperature in 90 minutes linear trend extrapolation from values of the last 10 minutes Roadway condition > 2°C  2°C > 0 K  0 K > 0 K  0 K dry moist or wet Skid-hazard conditions present Slippery snow or freezing rain possible in the case of precipitation and roadway frost possible Slippery snow or freezing rain possible immediately in the case of precipitation Slippery snow or freezing rain possible immediately in the case of precipitation and roadway frost possible Roadway surface temperature in 90 minutes linear trend extrapolation from values of the last 10 minutes  2°C > 2°C No values available Roadway condition dry moist or wet Roadway condition moist or wet dry No risk of skid-hazard conditions Black ice possible immediately Trend calculation not possible Slippery snow or freezing rain possible immediately in the case of precipitation and roadway frost possible immediately Slippery snow or freezing rain possible in the case of precipitation Black ice possible Risk of skid hazard possible if weather changes Ralf Meschede/Horst Badelt

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