1. Kawazu-Nanadaru Loop Bridge

Kawazu-Nanadaru Loop Bridge also called the Japanese Double-loop spiral, in Kawazu, Japan. It was completed in 1982 and it is about 147feets. It rotates traffic through 720 degrees.

This double spiral brings cars up and down a full 45 meters while being suspended in a valley between two mountainsides. The spirals measure 80m in diameter and the full ramp section is 1.1km long. The speed limit on the bridge is only 30km/hrs

The bridge on Highway 414 between Tokyo and the Izu peninsular was achieved in 1982 and has become a well-known landmark since. It is a tremendous bit of architecture.

(2) Takaosan Interchange

From a design perspective, one of the most structurally gorgeous interchanges in Japan is the Takaosan Interchange found in the Western suburbs of Tokyo. It was completed in 2012, it’s a 12-way interchange that joins Route 20 with the Ken’odo.

It’s curled up in between mountains perhaps that is what transpired in the beautifully curvaceous structure.