Once, when on a trip to Houston for the college paper, got a rental car up to 110MPH on the I-10 between New Orleans and the Texas border. Along there, it's raised highway, two lanes in either direction and separate bridges for both directions. The only way you're getting caught is if you blow by a cop. So, I took it to 110.
Next day, driving back east from Houston, I got nailed for doing 65 in a 55 just inside the Texas border (before the split starts). Felt like telling the cop "Sixty five? You should have seen me yesterday!"