[pc86]

I've seen others mention the yellow-light timing issue and I hadn't heard this counterpoint before.

As for the discretion, at least in my jurisdiction all automated violations (currently only red light cameras in certain parts of the state I believe, nothing in my immediate area) are reviewed by a police officer who has final say. Presumably they'd be able to tell if a vehicle just slid a few inches into the intersection v. ran the light 2 seconds after it turned red.