Going back about 5 steps (step -2 does nto include the event) it seems the silver renault has been out over the line for a while and has not moved, stalled perhaps? Green man, seeing the opportunity, attempts to filter directly into the middle lane and is perhaps not blamed as previously thought.
It is, of course, impossible to know, but I love the speculation that these google streetview captures present... its like a nearly interactive version of Crown Court