Gravelly Hill Interchange, the intersection of the M6 motorway, A38(M) motorway A38 road and A5127 road above two railway lines, three canals and two rivers in Birmingham, England ......
2. That maybe of course the channel tunnel but ~I don't know if you would class that as all' British'. Then there is of course the network of sewage tunnels in most cities, or then again there is the London Tube network. Methinks you need to think about the question again.