Get off exits 21 or 22 and get onto Plantation St going up the hill toward Umass med school/hospital. As you crest the hill and see the science research buildings on the right and a funeral home by the light on the left, watch out for cops. As a matter of fact, go 30 before you crest the hill. They stand to the right, close to the next stoplight/intersection, directly across from funeral home. Speed changes from 40 (suggested) to 30 right in the middle of a small downhill, but I think they get people right at the top of the hill. They pull people over like 3-4 cars at a time, and it is totally not fair, because right before the 30mph sign, there is a suggested speed of 40mph sign. It is insane. I know multiple people being pulled over when they knew exactly that they were Not speeding.