Your exposure is dead on. The composition is very well put together. I love the colors and the small details. The only thing I would change, and this isn't something thats extremely necessary, is that I would have taken the photo into Adobe Light Room and increased the clarity a hint, to add a little more detail to the buildings.
I love the light trails that the various cars left behind, and I also think the jet stream in the sky is very cool too. Over all I think this photo is very well put together and a great example of what to look for in a long exposure shot. Very well done!