The last one is really cool with the traffic motion blurs. Did you capture these on several different days? What country/cities were you in? I like the black and white style but do you ever do any color shots?
Nice one ! You could try alternative croppings to reduce the open space on the left or balancing it by including more to the right (if available). I know that would put the turnstiles at the centre of the photo, but I think the mother looking towards her baby would be a sufficiently strong axis to put the focus on the kid.