The approach section of the Rainbow Bridge was floating in a circle behind the wall

The girders of the Rainbow Bridge are suspended 52m above sea level. Therefore, the road leading to the Rainbow Bridge must rise in altitude from ground level to a height of 52m. For this reason, there is an approach section of over 1 km at both ends of the bridge. The map shows that both the Odaiba and Shibaura sides have approach sections on the sea, and that on the Shibaura side, the road forms a circle on the sea to increase the distance. Although Shibaura was reclaimed after the Meiji era (1868-1912), there was probably no surplus land available in the 1990s when the Rainbow Bridge was built.

The Rainbow Bridge's girders are suspended at a height of 52meters so that the Queen Elizabeth 2, which was one of the world's largest luxury cruise ships, could pass under the bridge. In the 21st century, however, cruise ships are becoming larger and larger, and some are even larger than the Queen Elizabeth 2. Some of these ships can reach a height of 70 meters above the water, making it impossible for them to pass under the Rainbow Bridge. It is interesting to note that the Queen Elizabeth 2, which was considered the Merkmahal, has never passed through the Rainbow Bridge. The designers were very conscious of the fact that the Rainbow Bridge would be there anytime, but the key player was not interested in the Rainbow Bridge. It was a stunning turn of events.

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