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Additional resources for Highway Meteorology
Road microclimate 43 (c) computer and communication networking; (d) road-weather forecasts: snow and ice prediction. All this information has to be presented to the highway engineer in a way that can be easily assimilated and acted upon. It is also sensible to keep a statistical record of the road-weather conditions and subsequent maintenance actions, for management appraisal of effectiveness. 2 ROAD MICROCLIMATE Road surface conditions vary both spatially and temporally within a given road network.
6 shows the variation of minimum air temperature with altitude for twelve sensor sites in Hereford and Worcester under the © 2003 Taylor & Francis Books, Inc. 6 Variation of mean minimum air temperature with altitude for twelve sensor sites in Hereford and Worcester, 1988/89. 1(d). 1 (d). The coldest air temperatures occur in valley bottoms in calm clear conditions. (b) Topography Topography restricts radiational cooling of a road surface, limiting the amount of long-wave radiation that can escape from the road by controlling the sky-view factor.
1K. Thermal mapping surveys are normally carried out when the average road surface temperature is below +5°C. 1 Terminology (a) Thermal mapping: The measurement of the spatial variation of road surface temperature along a road using an infra-red thermometer or camera. (b) Thermal fingerprint: The graphical representation of temperature (yaxis) plotted against distance (x-axis) for a particular route on a given night. 3. (c) Thermal map: The representation on a road map (usually 1:50000) of the average spatial variations of minimum road-surface temperature for different weather conditions.