Riding home from work at 6.30pm this evening, as I approached the Bunnings at Chirnside Park there was a row (5 or 6) of police vehicles parked on the grass embankment, with the lane closed with witches hats. There was a van prior to this with a camera like device pointing towards (but not directly at) the oncoming traffic. At the traffic lights for the turn into Bunnings there was a police 4WD on the median with its lights flashing and a car in front of it. There was no obvious police activity. I've seen this once before in Forest Hill with a van with the same device and 3 or 4 police vehicles immediately in the vicinity. Whatever was happening wasn't discreet and was nothing like an RBT or even random vehicle inspection. Any ideas?