Niigata Prefecture in north-western Japan, facing Sea of Japan, is one of the heaviest snowfall regions on the earth for its geographical features; spine of mountains in winter capture much of icy clouds brought by north-westerly strong seasonal wind, which are formed in the process of passing across the sea. East Nippon Expressway Company Limited, hereinafter NEXCO East, has carried out a series of addresses for approximately 30 years to ensure the safe, reliable, and comfort service in winter months through compiling kinds of manuals, developing snow and ice control facilities, making operations more efficient, providing traffic information to customers and so forth. Drifting snow and heavy snowfall, however, often reduces visibility, which forces expressways to be closed even in recent years. The cause by poor visibility occupies over 50% of all the closure time and length; therefore, it is regarded as the one of the most urgent issues. This paper describes the following points; a) General winter conditions in Niigata and existing countermeasures b) Trial approach by introducing a forecasting system for poor visibility and its outcomes c) Future direction.
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机译：日本西北部的Niigata县面对日本的海洋，是地球上最重的降雪区之一，为其地理特征;冬天的山脊捕捉到北风强大的季节风中的大部分冰冷的云层，这些风在穿过大海的过程中形成。 East Nippon Expressway Company Limited，下文中，Nexco East，已经进行了一系列地址约30年，以确保通过编译各种手册，开发冰雪和冰控制设施，使冬季的安全，可靠和舒适的服务。高效，向客户提供交通信息。然而，漂流的雪和大雪往往降低了可见性，即使近年来也要迫使高速公路进行封闭。可见性差的原因占据所有闭包时间和长度的50％以上;因此，它被认为是最紧迫的问题之一。本文描述了以下几点; a）Niigata的一般冬季条件和现行对策B）通过引入可见性差和其成果C的预测系统来试验方法。
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