Over the years, the Philly one has had various indicators as to purpose, such as a trailer pulling a ghost bike. Haven't done one in several years, either due to weather or forgetfulness. Thanks for the reminder. It starts less than a 5 min. ride from my house, and we do have police *******.
What never ceases to amaze me is that some participants cannot resist the urge to talk. There was also a crash one year. A woman looked back for a friend just as she hit a big dip in the street. Front wheel turned sideways and she hit the ground. No serious injury.