You're not asking the right question, cmolt. Someone driving significantly slower than the average speed on a highway is at least as much of a hazard as someone driving significantly above that average speed. It's the speed relative to other vehicles that matters. It's much safer for all the cars on the freeway to be moving about 70 mph than for 99% of them to be doing 70 and 1% to be doing 50, EVEN IF THE LIMIT IS 55.

It is just as true to say that it would be safer for all the cars to be doing 55 instead of 99% at 55 and 1% at 70.

One of the issues with US highway traffic is that regulators ignore the science. Traffic research shows that the ideal speed on a highway is that at which about 85% of drivers naturally drive, and the number of people who routinely exceed the speed limits on many roads suggests that they are set too low. Sometimes this is due to a statewide maximum, sometimes it's due to local governments looking at drivers as a revenue stream.

In "setting a trap" I think you've fallen into one that was already there.