Very nice Adrian
I particularly like the motorcycle and car photos, but I felt they would have benifited from a few more moving vehicles. Just to show the speed and congestion of the city. Also I think that the last one may have worked as a b& w photo too. That way they could be viewed as a collection, and not 6 separate photos.
One more thought. I think that the black & white really works here with all of the linear elements and the light and shadow, as well as the fact that cities are "concrete jungles."
Overall, I really like all of them. [smilie=t: