I think you need some sort of spot lights on your car to make it standout. And watch out for color shift from some of the street lights. I've seen some pretty nifty effects done by using multiple exposures with someone walking around the subject firing a hand held flash unit. They use this technique a lot in those caving pictures you will see in National Geographic where the cave is way too large to get with a single flash. But I imagine it takes a lot of practice to get that done right.
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