Sometimes known as the Japanese Double loop spiral, this unique structure looks more like a roller coaster than a motorway on/off ramp. But how else do you get vehicles up or down the 45m (148 ft) to join or leave the traffic? The architect certainly needed some ingenuity to come up with the plan and the bridge was completed in 1982. The bridge is on Highway 414 between Tokyo and the Izu peninsular and is a well known landmark. The spirals measure 80m in diameter and the whole ramp section is 1.1km long.