In this study, we analyzed how has the road discount policy for the automobile market affected the car ferry market. First, we estimated the demand function of the Seto Inland Sea areas’ car ferry market with the consideration of the automobile market in Honshū–Shikoku Bridge Project. And we simulated how the amount of CO2 emission changed by the road discount policy. As our result, it was revealed that the amount of CO2 emission increased 4,500 tons or more per year by the road discount policy.
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