The Shiribeshi Expressway was made to provide a high-speed alternate route to Japan National Route 5 in Shiribeshi Subprefecture . After the events of the 2011 Tōhoku earthquake and tsunami , it was deemed necessary to provide an inland route during a tsunami event . Frequent volcanic activity from Mount Usu to the south also increased the demand of such a high-speed route
2011 Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
Shiribeshi Expressway