Every month anywhere from several hundred to a few thousand bicycle riders participate in an event called "Critical Mass."  They ride through downtown Houston in a large group ignoring traffic lights and, whenever possible, cars.  Apparently, they consider it some kind of demonstration, but the only thing they demonstrate is selfish, childish, irresponsible, dangerous beghavior on our city streets. It is not unusual to be stuck for more than half an hour waiting for these adult children to get out of the way.  Many of the bikes are not street legal for night riding and many of the participants are drinking alcohol while they ride.  Before someone dies either on a bicycle or waiting for an ambulance that cannot get through, make the Houston Police Department do its job and stamp out this public menace once and for all.