How is this done?

[hhscr]

Looking to take some photos at night of buildings but also want to have the streaks of light of the passing cars without stopping the action of the cars, how should I set this up. I know a tripod is a must and that a long exposure will be needed to get the car light streaks but not sure how to keep any lights and details on the buildings and background from getting overexposed.

[Wes]

In a nutshell, I've found that a small aperture works well. If you're going to do a long exposure it won't hurt to set your aperture to f/14 or higher.

[Daniel Bates]

You can use a small aperture, low ISO, and possibly a ND (neutral density) filter to get a proper exposure with a long shutter speed.

[hhscr]

Thanks for the replys sounds too easy, guess I was making it harder than it is.