Texas would have the highest speed limit in the United States, under legislation just passed by the Texas House.

85 miles per hour.

The link is from Metafilter, where one commenter points out that Texas seems to be inspired by "Europe." The article quotes the bill's sponsor:

"They have high-speed roadways in Europe, and there could be some merit in having some of those highways in Texas," said Rep. Lois Kolkhorst, R-Brenham, who introduced the bill. "Given the right engineering, we should consider it."

As Bruce Bartlett has said in a different context (transcribed in this old post):

We're traveling down the route of Europe. And many Americans just hate that idea. If you're in any group of conservatives, and you say, "Oh, that will take us down the route of Europe," they will say, "Oh no, we don't want to do that! That's awful!" Nobody ever explains what's so terrible about Europe.