I was suspicious, so I looked it up. 40 miles of one road in tx is 85mph.
"What this translates to in reality is an average interstate speed limit of 75 mph in both rural and urban areas (though some segments within city limits are 70 mph).
There are several segments of I-10 and I-20 through the state that have max speed limits of 80 mph.
Then, there’s Texas’s claim to speed limit fame – the single stretch of freeway in the country with a speed limit of 85 mph.
I've driven the entirety of that road one time. It ran me about twenty bucks in tolls. To do it once was worth it. With an 85 limit, most were pushing a hundred. I got down to San Antonio in a fraction of the time it would've taken via 35. I certainly wouldn't want to pay that on a daily commute though. I also don't think I'd want to navigate the speeds some of the more aggressive drivers were going. I did feel a little bit unsafe.