Agree with what's been said already, I'd add that you should try to time your shots a bit better which would prevent things like the car changing lanes and starting while midframe. It can mean more time and more shot attempts, but I'm constantly conscious of it when I shoot moving vehicles. I often try for both: with cars and without. Which gives me twice as many opportunities when shooting.
As for PP, I would probably do some clone work with some of the flare that you have, and I'd do a bit of distortion correction. Last bit of advice, would be to shoot a bit earlier and see if you could get some blue into your skies.