Of course, the NTSB can’t order the state or federal governments to do anything. They can only make recommendations about that one fewer beer.
Obviously written by a naive fool .... remember back to the 55 mph “suggestions”. You could ignore the mandate but the Feds would reduce or eliminate Federal matching funds for US Highway building and maintenance in the states refusing ... just ask Texas and several other Western states.
In Texas the EPA has been setting speed limits in major cities like Houston (can’t go above 60 on the highways because of “pollution”).
And they would fascistcly order states for more enforcement after they would lay down hoses and count the number if vehicles exceeding their limit.
If a state didn’t comply they would hill back Federal highway funds. Hence the atrocious attention on areas such as speeding, seatbelt and cellphone enforcement. So cops aren’t out doing what they want which is to be very visible in their communities as a visible deterrent