This 270 degree loop is a sceneic part of route 357 from Shibaura to Odaiba. The local (free) route 357 uses this loop, and it shared with a Yurikamome monorail line.
The Shuto toll road number 11 crossing over the upper level of rainbow bridge does not follow this loop.
Wikipedia article:
http://en.wikipedia.org/wiki/YurikamomeCategory:
line monorail road road bridge Address:
Tokyo Route 357