This is a straight stretch of road where the traffic flow often tends to push 55. The limit is 40, which is ludicrously low, since I remember when it was 45 a decade ago. The cops most often appear to be clocking people from the Wilke Road courthouse across from the track, often obscured by or parked within an enclosed parking structure. Another spot for them is to be parked in the track entrance while the gates are closed. Also, I have seen them sitting obscured by foliage off to the side of the intersection at Rohlwing Road; this is probably meant to get people who are coming off of the Route 53 expressway (also a handy point for them because this is where the limit goes down from 45 to 40). Enforcement west of Wilke Road is by the Rolling Meadows PD.