Passing in the night

I've been searching for a good location to do some long exposure photography with passing vehicles.  Here's a shot I made tonight about 30 minutes after sunset.  Finding a spot perched a bit above the road isn't the easiest thing here in Tampa, which seems to be pretty flat everywhere.  Anyway, I'm still new at making these types of shots, so I'm learning as I go.  Please feel free to let me know what you think.  As always, click on the picture to see a bigger version, which is a good idea with this shot.