I do like the third one, I must admit. The light trails neatly lead off into nowhere (rather than abruptly stopping), and the sky, although barely visible, is fantastic and moody. In some of the photos, though, there are too many light trails, and all the fine lines blur into one. I'd recommend a faster shutter speed, somewhere in between #2 and #3. You might want to open up your aperture, too, to catch the fantastic sky in the background.
Still, some really nice shots, full of colour, composition and contrast. Ah, I can remember the first time I did light trails. Really should do 'em again sometime. A little tip, too: A shutter speed of 1-2 seconds can give some really interesting results, blurring individual cars but not making the lights form into one blur. Kinda like number 2, but more so.