This shot is a locked off camera. The original footage is time lapse and since changing this to a night shot require very intensive paint over, I'm not sure what to do with those moving cars. I'm trying to avoid painting them back in frame by frame. Since the final matte painting doesn't have to be a time lapse, one option would be to paint a layer of cars with lights on and animate them manually, then I could paint a depth map of the street and surroundings and animate 2.5D lights that are moving with those cars. That way I could get those cars to emit light to surrounding trees and buildings too and make them a little bit more believable.
I'll have to think about that and ask for opinions..