I recall when the federal government lowered the speed limit to 55. Yes, I hated 55 too. Any state that chose to not enforce it lost some federal funding. I can't recall any state that didn't fall in line.
Why are people so willing to give relinquish so much of our power, authority, and liberty to the federal government. Especially when traffic laws are the auspices of the various state governments.
By the way, the 55 MPH national speed limit was eliminated because it was a law that >>>"did not serve the people". Further, nearly every state allow motorists to top that speed limit by 10 MPH, and in some cases 15 MPH, simply because it wasn't a viable law, and largely unenforceable.
While the 55mph speed limit was in place. I drove from NJ to Ga, a few dozen times, and although I was cruising at 70 mph, I never once was issued a ticket for it, Further when I finally moved here, I ad a 102 mile drive to work each morning and a 102 miles drive home each night. That drive was between the north end of Atlanta and Macon, Ga. on I-75. Needless to say, my speed was well north of 55 MPH, and though I passed countless Georgia State Patrol cars, I had never been stopped during that 2 years period.
It became a law of discretion similar to seat belt laws. In other words, if the cop needed a reason to stop you...
In any case, the federal government is NOT the place for such a law. It's the auspices of the state, and that's where the law should stay.