This bridge is called Archy and I think that is totally lame... but thats just me. I couldnt decide between B&W or color. I did some level tweaks to both and some minor brightness/contrast tweaks.
<img src = "http://i15.photobucket.com/albums/a392/afdlips/archysmall.jpg"><img src = "http://i15.photobucket.com/albums/a392/afdlips/archycolorsmall.jpg">

My vote is for the color version. The B&W is OK, but the color version really pops.

The colour one for me as well. It gives the shot the mood it deserves. All those different night hues is IMO what makes this shot. The black & white one just doesn't the impact the colour one has.

Color version is better.

I agree with the others colour definately an advantage for this shot.

Roger

Colour definitely.
But I'd add that you could shoot angled lower.

With wide angle, you don't need as wide as fish-eye, you can see the curve in the trails of the cars in the opposite direction to the curve of the bridge.

Try taking about 1/3 or 1/6 off the top of the image and use the complete light trails a the bottom.
I think it would be an even better image.

Color definitely! Nice photos.