Here in Mass. the speed limit is 65 mph on every highway. But if all the traffic is traveling 70-75 mph, and you are keeping up with it, it is very doubtful you will get stopped. It is when you are in the passing lane and going 45-50 mph and impeding the traffic that you will get pulled over. Or if you are weaving in and out of traffic and changing lanes. You will definitely pulled over.
Our cops hate paper work. Although in the event you take it to court, they are only too happy to appear against you. That counts as overtime.
Do not expect to get anywhere in a hurry in the early morning or late afternoon. Bumper to bumper cars trying to get to work in a hurry or home. The south shore is notorious for accidents and horrible traffic jams. No worry there about getting a ticket for speeding.
The North Shore is not much better. We have all the folks from NH coming to work in Mass. I do wish they would find work in their own state.