There are two sensors side by side the same distance apart all the way across the road. That's for measuring speed. They are measuring speed AND traffic volume.
If all they were interested in was the traffic volume, there would only be one sensor, and they wouldn't have the same thing in 4 locations that don't have any intersections between them! They are measuring how fast vehicles are going at specific locations on the road where it is proposed that they are going to put a speed bump. If more than X percent of vehicles are travelling more than Y above the posted speed limit and the traffic volume is more than Z, that's the justification that they can use in the engineering study. We, the public, don't know what X, Y, and Z are. (In Toronto, apparently X is 85% and Y is 10 km/h above the limit, don't know what Z is.)
So, if you are interested in not having speed bumps on that road, let's not be giving them the engineering justification to do it. If everyone, or almost everyone, is following the speed limit anyway, then the outcome of the engineering study will be that the speed bumps are not recommended because there is no justification for them.
My contribution today was two vehicles passing through the study locations at or slightly below the posted speed limit.