The junction at the bottom of Court Lane where it joins Dulwich Village isn't great either traffic wise - although one short bad jam is probably better than getting stuck on the South Circ, stuck at the roundabout and then at two sets of lights!
On one of the threads around extending the 63, someone came up with routing the P4 along Wood Vale but feeling there was that so many people wanted to use the service along Honor Oak Road that it would be a downgrade for them.