According to this, Texas, Iowa, Indiana will be shortly raising their speed limits on some stretches of roadway:

Iowa: 70MPH
Indiana: 70MPH
Texas: 80MPH

In other news, most people can't safely drive more than 60MPH, if that. And, 80MPH translates into people doing 90MPH and some even pushing for the century mark. At that speed it's no longer roadkill, it's hamburger. And:

This new [Iowa] limit better reflects the actual speed of cars on rural highways which averages 69.8 MPH according to sensors embedded into the pavement.

My guess is they'll be saying that same thing when the sensors read 79.9 MPH.

In other, oddly enoughly related news, see "City may end speed limits in high crime areas". Yes, that picture is from the lovely city of Rio de Janeiro, which is dropping their speed limits in some parts of their fine city at night. The reason? So people can get the fsck out of the slums and avoid getting 'jacked.