How long is it necessary to remained stopped at a stop sign when a cop is watching? Well that depends if the cop has the right of way. Until he is gone, even if that is several minutes. Beware if you make a left turn, even when the cop is just sitting, waiting, stalling traffic. Police baiting the citizens in Beaumont, Alberta is getting excessive.
Beaumont has long liked it stop signs, some of them requiring the road with more traffic to stop. Yah, backwards to what it should be, but there are reasons: dinosaurs in town hall. Now, it has a lot of them, and the police like to pull up with an intention of going through, across a legal high level road, and waiting, and waiting, and waiting.
And now, if you would like to turn left, in front of the cop, he has the right of way. Now failure to yield the right of way is not a minor charge, but it is a revenue generator for the dinosaurs and cops. Baiting is what it really is.