We do have speed limits on the water: 6 MPH, where necessary, and for good reason. It's not unlike driving in-town and I think the need is obvious. Out on the highway, speed limits are mostly set to keep the speed differential down. With mere inches between vehicles, it's a good idea to keep the speed differential in check. This is why we have lower limits on the highway as well.
With at least 150 feet, by law, between boats exceeding 6 MPH, the speed differential is as relevant as the speed differential between your car on route 93 and a tree 150 feet from your car on the side of the highway. Do you ever feel compelled to slow to 45 solely because of trees near the highway?
Some, including me, would argue that some highway speed limits are set for revenue enhancement. I think the heavily patrolled 55 MPH zones on 93 by Manchester, Concord and Salem are perfect examples of this.
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