This is a crescent-shaped ring road around the Isle of Dogs, in the East End of London.
Travelling along the road from West to East, the road starts in Limehouse and ends in Poplar.
Westferry Road
This section starts at the junction of Westferry Road with West India Dock Road. Limehouse Causeway meets Westferry Road at this point. The road goes under Westferry DLR station almost immediately.
References
A1206 road (Great Britain) Wikipedia(Text) CC BY-SA