Walking through the streets of Vancouver one weekend, we came up to an intersection.  There was a Porsche sitting on a trailer with two people in it.  It quickly became apparent that they were doing some filming.  The woman was an actor and the man was filming here.  There was a vehicle pulling the trailer with some of the production staff sitting on it.  Initially I was focused on what they were doing but then I started to look around.

The whole convoy was all related to the filming.  There was a motorcycle escort supporting them and other vehicles from the production team.  Everything on the street was controlled.  You often feel when watching street scenes that they are filming in an open environment but a lot of the time it is totally controlled.  Only us and the other pedestrians could be considered random variables in the whole process.  The light stayed red for a while with the cameraman trying a variety of positions and then the lights changed and the whole ground headed off to the next block.  We went on our way too.