Carmel police often set along I-465 at the Marion-Hamilton county line where their jurisdiction begins. This is just past 96th Street east-bound, and about a half mile west of Keystone, west-bound. I’ve seen more west-bound though. They will pull over any random car going more than the posted 55 mph speed limit, doesn’t matter if the car is being passed by others or not. They patrol any time of day; I’ve even seen them out during rush hour when traffic is stop and go. Heavy enforcement does seem to be skewed towards the last week of the month though.