1Eshima Ohashi, Japan

Looking at a picture of this infamous bridge, you could be forgiven for mistaking it for some sort of endurance run for racing cars. Proof that you can’t judge a book by its cover, this seemingly incredibly steep motorway only has a maximum gradient of 6.1 per cent.

For comparison, cyclist’s favourite Box Hill in Surrey has an average gradient of five per cent. At almost one and a half miles, the Eshima Ohashi Bridge connecting Matsue and Sakaiminato is the largest rigid frame bridge in Japan.

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