The trap is usually set up in the islands between the ramps for Exits 38 A-B on either side of MA State Rte. 2 Eastbound or Westbound. Eastbound you are blind to the trap until you are on top of it, so it is most commonly enforced on this side. Westbound, you can see straight ahead and downhill for 3/4 mile leading up to the trap, so you have a chance to see it well ahead. Both MA State Police and Harvard Police have been seen enforcing the trap. Speed Limit is 55mph here, but traffic commonly runs 10-15 mph over this, especially if traffic is light.