How to approach driver after near-miss?
On the whole I think it is best to not approach drivers when out cycling.  Sometimes a 'near miss' is unintentional, sometimes it is due to carelessness and sometimes it might be intentional.  The trouble is, from a cyclist point of view it is often hard to tell which it was.  

When approaching a driver after an incident it is difficult for the situation to not become confrontational.  In my experience it is therefore safest to try to remain calm and just get on with your bike ride.  Approaching drivers after an incident has never resulted in me coming away from the incident feeling better, and has never improved my enjoyment of the bike ride.  Generally incidents result from something outwith my control, and I find it best to just forget it and get back to enjoying riding my bike