Toronto Police used to do this once a year, but with more cyclists on the road these days, they are doing this multiple times per year:
Between Monday, August 23, 2010 and Wednesday, August 25, 2010, 54 and 55 Divisions will be joining together and enforcing bicycle and pedestrian rules of the road.
To date, eight of the 12 pedestrian deaths in Toronto have involved crossing the street mid−block. There has also been a noticeable increase in bicycle collisions involving motor vehicles.
Cyclists must obey traffic laws and ensure the required bicycle equipment is in proper working order. Drivers must check blind spots prior to turning and to be alert when opening a car door into the path of traffic.
I’ve been stopped during one of these campaigns, and as long as you are a safe cyclist with the proper equipment (bell, lights, etc) you don’t have anything to worry about.