A sea transportation network using high -speed car ferries of over 35knots is proposed for Seto Inland Sea. Such ferries run as fast as the average speed of a car on highway, and can travel a shorter distance than the distance through the highway . Therefore, the required times between most of cities by the ferries are shorter than that for a car using highway. The result of an analysis of the commercial profit demonstrates that the sea transportation by the high -speed ferries can compete with other transportation networks using conventional ferries, highway, etc.
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