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The photo was taken from circa 6 kilometers away (across the bay).

According to Japanese Wikipedia, the bridge grade is 6.1% which is not extraordinary at all, in Germany some motorways have a grade of 7 or 8%.

http://ja.wikipedia.org/wiki/江島大橋

What is more impressive is the length of the main span; 250 meters, which is very long for a concrete cantilever box girder bridge.
 
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