Hydrogen powered cars

As I watched the news last night, I noticed that the hydrogen powered car was dripping water out the tail pipe. Ten as I watched, it hit me: thousands of cars stopping at busy intersections for as much as two minutes or more and dripping water from the tail pipes as well as the air conditioners and you have the making of a pretty sloppy intesection..Just wet enough to be sloppy and there goes all the clean cars down the tube..This would be perpetual in a place like downtown Houston and it might be noticed..Or maybe, what can a little clean water hurt..