The Seto-Ohashi Bridge is the longest combined road and rail bridge in the world.
The route via the Seto Ohashi Bridge was the first of the three routes linking Honshu and Shikoku opened to traffic. In an area studded with many islands, this route hops from one island to another across the Seto Inland Sea. Joining the city of Kurashiki in Okayama Prefecture on the Honshu side with Sakaide City in Kagawa Prefecture on the Shikoku side, the complete route was opened in 1988. Stretching across a total distance of 9.4 kilometers (5.8 miles) there are six bridge sections that span the gaps between islands that lie between the two cities, as well as four viaducts on the islands themselves. The whole route is a double-decker construction, with an expressway running above a railway. In terms of scale, it is the largest combined road and rail bridge system in the world. Among all, the 1100-meter (3,609-foot) central span of the 1,723-meter (5,653-foot) long Minami Bisan Seto Ohashi Bridge at the southernmost end is on its own the world's longest combined road and rail bridge.
Construction began in October, 1978. A total of over 1 trillion yen (7,692 million dollars; $1=130yen) was spent on this huge project, and it took ten years to be completed in April 1988. At present only normal trains are accommodated, but for future integration into the national high-speed railway network, the railway section is also designed to accommodate Shinkansen "bullet" trains. Due consideration has been given to the forces of nature, and the structure can withstand winds of up to 65 meters per second (146.25 m.p.h.) and earthquakes of magnitude 8.5.
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