Since the 1980s, the sea's northern and southern shores have been connected by the three routes of the Honshū–Shikoku Bridge Project, including the Great Seto Bridge, which serves both railroad and automobile traffic.
Desde a década de 1980, as costas norte e sur do mar foron conectadas polas tres rutas do Proxecto da Ponte de Honshū-Shikoku, incluíndo a Ponte Grande de Seto, que serve tanto o tráfico ferroviario como automobilístico.