Street Sweepers

So I'm waiting for the bus this morning, and one of those NYC street sweepers comes along to blow dust in everyone's face. And it just occurred to me that these things serve absolutely no purpose. They're trying to do all this stupid shit to cut costs in the city and close the MTA deficit blah blah, but still have the money to power these things up, pay people to drive them, and serve zero purpose? Hmm. I'm not exaggerating, either. The street looked exactly the same before and after the sweep, except leaf and dust particles were slightly rearranged. And a few were added. I'm just saying.