W Roxbury Pkwy is divided and 2 lanes in this short segment as you approach the traffic circle, but the speed limit is only 35. I have seen numerous cars pulled over on this stretch. Once I saw the trap set up in the parking lot of the Golf club on the right travelling NW toward the circle. (You crest a slight hill and curve as you approach). In the SE direction I picked off a cop parked in a private driveway using K-band radar. Brookline cops tend to leave their K-band on or maybe they lack instant-on capability. "Your speed is …xxx" units use X-band in Brookline whereas they usually have K-band in Boston.