About KANETA HISASHI
About 国土交通省 北海道開発局
About snowmelt
About road surface
About freeze proofing
About snowy cold region
About separator(road)
About grooving
About carriageway
About curved road
About medial strip
About freezing road surface
About Low cost road pavements,surface treatment,others
About Road maintenance and repair
About Glaciologic engineering,cold region construction
About 融雪水
About 凍結路面
About 防止対策
About 積雪寒冷地
About 対策