Come out of Philly on rt1 heading to the turnpike. 90+mph is normal and the cops won't even pull out if traffic is heavy. There's 6 lanes before it necks down at the turnpike interchange to 3. The turnpike is its own cluster depending on the time of day and area you're in. Actually thinking about it seems just about every major highway around here runs quite a bit faster then the speed limit most of the time.
Texas isn't far off, either. Our state's major corridor, I-35, seems to have a normal traffic flow between 75 and 95. The speed limit goes between 55 and 75, depending whether you're rural or in a major metropolitan area. I did once get pulled over for doing 74 in a 60 on the way to the junkyard, but the cop was cool; when I asked for a warning, he was like "Sure, I'll give you a warning, hold on a sec." I even told him I was trying to get to the junkyard before they closed! But elsewhere, people are FLYING. I once asked a cop, who also pulled me over and gave a warning (too much soot on my license plate, before I learned I had a boost leak on my long gone 2010 JSW), what the
unofficial thresholds were for speeding on I-10. He said 85mph, you're getting a warning, and 90mph, you're getting a Class C. The speed limit in that area is 75 and 70, but the flow of traffic is definitely between 80 and 90, though you occasionally see drivers from CA and other states driving in the passing lane doing 65-70 and just lingering there.
Ironically - SH-130, which goes from Luling (about 20-30 miles east of San Antonio off I-10) to Georgetown; there's a 39 mile stretch that's rated 85mph, fastest legal speed limit in the US. Yeah, some of us do keep cruise control around 90, but I've seen A LOT of drivers who want to do 70-75, including in the passing lane (so annoying). Almost ironic how the ultra fast speed limit results in people going slower, but the slower speed limits result in people zipping by.
Also, San Antonio got its first HOV lanes when they did improvements on I-10 a few years ago. I've never heard of anyone getting pulled over for using the HOV lane without having 2 or more passengers (no comment). There are no barricades, no warnings about fines, and I've only ever seen police in that area actually doing patrol maybe once? I'm sure they figure they have better things to do. Most people seem to use them as passing lanes or ultra fast lanes, anyways.