Michigan State Troopers park on the Southbound on-ramp (from the DaimlerChrysler HQ) onto I-75. They are parked high on the on-ramp (the part that is a bridge over the interstate) so you cannot see them as you are driving South on I-75. The typically radar or laser a vehicle from behind after it has passed them from the high vantage point on the overhead bridge. They are typically here after the 20th of the month and before holiday weekends.
Flow of traffic is usually 80-95mph here so make sure you slow down as you pass this area.