If you go cycling down in the Beckton area, near to where the big Tescos is, you can find the start of a road flyover which simply launches into space and stops. This was intended to be the link to the first bridge planned in that area in the 1980s (not sure of my dates). That was the bridge going over to link up to the A2 and having a big road carving through Oxleas Woods, which were thank goodness saved. Oxleas Woods being a good place to go cycling, and there is an excellent cafe at the top of the hill.