Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Great Seto Bridge, or Seto-Ohashi Bridge, is a series of double deck bridges connecting Okayama and Kagawa prefectures in Japan across a series of five small islands in the Seto Inland Sea. Built over the period 1978 1988, it is one of the three routes of the Honsh -Shikoku Bridge Project connecting Honsh and Shikoku islands. At 13.1 km long, it ranks as the world''s longest two-tiered bridge system.Crossing the bridge takes about 20 minutes by car or train. The ferry crossing before the bridge was built took about an hour. The non-discounted toll from Kojima, Kurashiki (Okayama Prefecture on the Honsh side) to Sakaide (Kagawa Prefecture on the Shikoku side) is Yen 3,500, and vice-versa.The bridges carry two lanes of highway traffic in each direction (Seto-Ch Expressway) on the upper deck and one railway track in each direction (Seto- hashi Line) onthe lower deck. The lower deck was designed to accommodate an additional Shinkansen rail line in each direction.