Road surface monitoring system installed in the infrastructure is very critical for determiningbraking distance required for maintaining vehicle interval. Research and development is alreadyproceeding on sensors for this purpose, including laser sensor, radiometer visual image camera andoptical fiber sensor. Radiometer has characteristics such as all-weather performance, day and nightuse and passive type, and t has been previously reported to enable discrimination of dry, wet, waterfilm, snow and ice road surface conditions by measuring the vertically and horizontally polarizedcomponents of emissivity. We installed radiometer in Hokkaido (northern Japan) and measuredslippery road surface, ice , packed snow, fresh snow and slush road conditions to clarify expectationsfor discrimination of these road surface conditions by using radiometer. As a result, it will beconfirmed that more detailed road surface conditions in the case of snow and ice are discriminated.
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