Set that speed limit wherever you want to, they are not going to stop doing what they do for that. Heck, back when the limit was 55 on most interstates, it was common place for trucks to go faster than they do today. You’re not going to stop them with tickets… Ever seen Smokey and the Bandit? That CB radio is an effective tool. IMO, it’s better than a radar detector.
The fact is, what really limits the speed on most trucks today is the governor on the truck and the limit that is set by the company (or the owner - operator in some cases) to improve fuel economy, lower wear and tear, improve safety, and last but not least, most of the time they get a discount on their insurance for it. It’s about $$$$$$$, and as evil as that sounds, it’s the best motivator because it accomplishes the goal. That is why most of the big outfits like JB Hunt, Wal-Mart, Werner, Schneider, etc. all limit their trucks to 65 or 68 mph. It saves a lot of things, which all translate into dollars, and that’s why companies exist… to make money.
I bought a rig a few months ago for my boss, and helped set up our trucking department. We set the limit at 68 mph on cruise and 74 mph on the pedal. I had no idea you could have 2 limits, but we did it to avoid becoming part of, or the cause of, a 65 mph traffic jam. Two trucks trying to pass one another, both governed at or around the same speed, with 10 to 20 cars behind them… there is little good that comes out of that. We choose to not contribute to the problem if we can help it.
My grandfather drove for 55 years before he retired. I rode with him in the 80s and 90s on every holiday or summer vacation I could. My cousins and I had to draw straws to see who’s turn it was.
In the 80s and early 90s, Pawpaw drove fast. Keep in mind that twice in my lifetime, he was the recipient of “million mile zero accident” awards. During the day time and anytime there were cars around, he drove the speed limit. But when that sun went down and there was no traffic, there weren’t enough numbers on the speedometer for him. His 1986 International 9300 had a speedometer that topped out at 85mph. One night I saw it go past 85 and start over again back to the 5 mph mark. That cummins was bellowing.
By the late 90s and 2000s, that all ended. Insurance, diesel fuel, and maintenance cost got to a point where it wasn’t worth it. He was just happy to still be driving. right before he retired, he’d take a 400 mile trip and drag in out into a 2 or 3 day affair. Just enjoying his craft and driving 55 or 60 mph.