Beginning of a good poem. The imagery is great, concisely descriptive and effective. It's not a 'read-once' kind of poem though. The picture built up in my head better after 3 scans, so my only constructive criticism would be to lighten it up a little. If you included some animation for your subject e.g. "... Walk. Briskly crossed the ribbon of asphalt, slaloming through the contraflow of on coming traffic. People living Big Apple lives, going the other way...."
Rubbish example but I've always found it best to animate the 'reader' if the poem is heavily descriptive of an environment. lighten it up a little, make it more accessible to the reader, but keep the cleaver adjectives and strong metaphors - (if it was your intention to not include the things I've suggested, my apologies. I offer merely a humble opinion as it's reader.)
IHI