| 摘要 |
PROBLEM TO BE SOLVED: To provide an estimation method, for a road surface state, in which a detectable range is wide, in which even a long road can be covered, which is simple as a system, in which an influence based on elements other than a meteorological amount is taken into account and in which the road surface state of a road such as a wet state, a snow cover state, a freezing state or the like can be estimated directly. SOLUTION: The method estimates the road surface state on the basis of the meteorological amount measured by a meteorological sesnor installed at the road and on the basis of each meteorological amount found by using wide- area meteorological data around the road. A road-surface physical quantity in the estimation expression of the road surface state is combined with a road temperature change rate with reference to the total heat balance. Thereby, the road surface state is estimated.
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