I was informed today by a resident in Dunstans Rd that the traffic lights have been installed because of the amount of heavy plant and machinery expected in the next few months. By all accounts 50-100 earth moving lorries per day will turn into London Rd as work commences on a new water feed pipe running from the reservoir in Honor Oak to, I believe, Water lane in Brixton. The pipe is to be 10 metres in diameter and a tunnel boring machine will be deployed. At the moment we are not sure where the spoil is going to be unloaded but I'm sure that you can come up with some suggestions. I thought that would cheer you up !
If correct, this seems a very strange reason to install the lights. Firstly, the lights were installed quite a few months ago which is unusually far-sighted! Secondly, if this a temporary project, why have they installed permanent lights rather than temporary lights? And thirdly, I can't understand how this relates to the lorries anyway! The route your resident friend described doesn't pass through Forest Hill Road...all very odd.