I made this image in the spring of this year, with a Phillips 7x17 camera and a 355 G Claron. The exposure was 25 minutes. I got lucky with the traffic out of SFO!
I think your result justifies your long exposure. A B&W shot allows us to study the detail that you have captured. I would imagine a colour shot probably already exists as a postcard and is bought on it's colour impact value. I prefer your approach to the subject.