They will sit in the medians near the exit ramps of 72, 77, and 83 to catch anyone doing over 65. Don’t know if there is a grace of 5mph. ISHP uses black cars, they are hard to see without good lighting even with Hi-Beams. There are also the big yellow cansiters sitting in a lot of the U-turn which they can hide behind. Probably more active on weekend games and Beginging and end of the school year for ND. The cop i dealt with was a jerk at first but let me off on the speeding but I wouldn’t press on trying to fight it with the officers.