I have seen this a lot around the streets connecting with US19 in Pinellas and Pasco Counties. Would be something of a death wish if they did this on US19 though even if I can recall it happening occasionally. US19, is-- or at least, was-- one of the deadliest highways in the United States.

I would think that if it is for some kind of charity, the laws passed to curb it, would not pass a First Amendment challenge.