These are extremely difficult shots to do. Especially in the dark because it leaves a lot more room for error because the shutter has to be open a little longer, which makes it harder to get the subject crystal clear in a distorted background, many kudos for trying!
My preference would be to crop out the left hand side (and perhaps that thick white streak at the top). Having the car so close to the centre just doesn't work for me.
I like so much of pannings. Is my prefferd photo technique. If you want to get it best, try to follow your subject at leat 30º with your two eyes open, one in the subject other in camera´s viewfinder. It really works well.
I realize this is a very difficult shot but I would like to see a little better focus on the point of interest (panning car). Good idea and neat photo.