The camera shows the parts of the road that are closed but not the traffic, so not terribly useful. In fact, it might be misleading, as the traffic on the right is the traffic that is tailing back, but you can't see how far. The traffic on the left is free-flowing because it has just passed the temporary lights. So it looks like the road is clear when it isn't just off-camera.

I was up in Forest Hill mid-morning. Traffic was slow, but moving. I couldn't see how far up London Road and Dartmouth Road it was tailing back. Traffic turning into the South Circular from Waldram Crescent wasn't too bad, with the queue only going as far as Finches.