Route 10 is a 4 lane, divided highway with a 50 MPH speed limit at that point. Just before the long uphill stretch on the east bound side (where folks typically speed up to 55-60 due to the good visibility and long, straight stretch) Roxbury police set up at the abandoned Shell station, or thereabouts, looking for "aggressive drivers" – including speeders, seat-belt law-breakers, or whatever they can think of.