I think your driver carries the can here. Although he had gone through on a green when the lights changed it’s only common sense that traffic is now going to come in from the left. He was slow off the mark, for whatever reason and left more than enough invitation for your average civvy to fill the hole. Not helped by the civvy dropping in via the blind spot which of course your driver should be well aware of. Hope I’m wrong though but tell your fella to WAKE UP!