honestly i cant critque you for i have no experience in photography my favorite is the 2nd it reminds me of the stop sign at the end of my street that says Stop Bush
I love love love the first one, the black and white works so well. Did you sharpen it a bit? It looks so. The second is okay, but it's my least favorite. I love the sky in the back, but the stop sign seems a little too bright and popping outtish for the picture. It would be better if it was a bit softer. The third is very nice as well. I love the angle of the shot, very artistic. The only thing is that it would've been nicer if there was a teeny bit more of the street sign in it.
I like them all, I too am a photographer, I just do nature though, but for me the best one is either 1 or 2, I like 3 as well, but the first two are, for me, the best, they're nice pictures =]