http://maps.google.co.uk/?hl=en&f=q&...01352,0.002494
From the aerial photo, it looks like two roads (Undercliff Road and
Halesworth Road) come out on Loampit Hill next to each other, with a 6-8
foot wall between them. I'm not aware of a feature like this anywhere else,
and can't help wondering why it was done here. It would be more normal to
run the side roads into each other so that there was only one junction on
Loampit Hill, and the land saved could be built on or beautified.