The effectiveness of roof snow control by sliding mechanism on the sloped roof is widely recognized, but many problems are remained to systemize the techniques on removing roof snow.
This paper presents fundamental study on the factors; characteristics of roof snow damage, regional characteristics of the damage, methods of removing roof snow, the frame on the systemization of roof snow control, and the state of studies on roof snow behavior, that are required in the systemization of the techniques on roof snow control.
From the study, it is clarified that the techniques on roof snow control should be supported by prediction technique and countermeasure technique against to the roof snow damage. The prediction technique is required to know roof snow behavior and damages occurred by roof snow. The systemization of roof snow control is strongly required in deep snow area of Japan. Furthermore it is required to organize the knowledge obtained by observational, experimental, or analytical approach.

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[in Japanese]

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In this paper, the author investigate the counterplan from view point of the Transportation Demand Management(TDM) which are how to reduce the traffic congestion due to the skiers at Yuzawa town in Niigata prefecture. The current situation of the traffic congestion and the traffic information are analyzed, and developed the traffic simulation model to evaluate the effects of the TDM. The results may be summarized as follows :
(1) The main reason of the traffic congestion is due to "the chain control" which means that a car can't enter the highway road without the devices to prevent from slipping such as the tire chains or the studdless tires when snow on the road.
(2) The PR of the traffic information and the places of the parking area to install the chains are necessary for drivers to decrease the traffic congestion.
(3) It is cleared that the park and bus ride system (P&BR) is possibility to reduce the amount of the traffic by the traffic simulation model.

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