Are OTR truckers restricted from speeding?

My trucks had a governor , would only go 64 MPH ! I never got a speeding ticket ! What was aggravating was to be behind some one going 63 MPH , we could never get up enough speed to pass !

For years, part of my retirement plan was just park my old Pete, and only work enough to pay the insurance unless something was going on that raised demand for trucks short term. But when the regs said I would have to go to E-logs that idea went out the window. I don't think I ever slept 10 hours straight. And for years I have been of the mind I can't get where I'm going driving 10 hrs a day, load likely ain't worth hauling. But, if about 2-3 afternoon I see I will be hitting a metro in rush hour, I would stop, take a couple of hr nap, then drive thru supper time. Depending on how much time I spent waiting to load/unload that day, that nap might put me over the 14 before I park for night. (Pretty good at napping while waiting, but that don't count either) Running my looseleaf paper, just get to where I spend the night couple hrs ahead of clock, be ready to roll next morning. E logs, from the time the truck turns a wheel, 14 hours later, it tells on you.
Now my old Cat never got great mileage, but running 62 MPH, if limits allowed, was best for average speed/fuel burned/aggravation. If the load needed to get there in less time, better be more than average money on the table.
I heard years ago, if a truck was going to run in parts of Canada, law required speed to be limited. And when fuel costs spike, some fleets reset max on trucks.

The latest spike in fuel prices could have something to do with reduction of speed. More drivers could follow this example.

I spent 15 years in the trucking and transportation business.

Many companies have limits set on the rig. Speed limits may be regulated, and thus can't be exceeded, at any level the company desires. For example, many years ago, all the Schneider and JB Hunt trucks were limited to 55 mph.

They can also set the truck to not idle for longer than, oh lets say 10 minutes or whatever they want, to conserve fuel and emissions.

This is done not just to save money, but to help lower risk and liability. Everyone knows, or should know, that is a commercial truck, or you, are driving over the speed limit and have a wreck, you are exposed to much more penalty and liability, or the government and the lawyers will be lined up trying to get in on going after you.

Some companies will pay a driver bonus for meeting or exceeding a fuel mileage mark. Get better mileage, get a bigger pay check.

Many OTR trucks built since 2000 have been required to be equipped with an ELD, Electronic Logging Device as of December, 2017. Electronic Logging Devices monitor drivers’ stats like speed, mileage, hours, driving habits, and location. Most companies and their insurance carriers generally don't look very kindly on too many over the speed limit flags on the logs. State/federal agencies do not have direct access to the ELD data, a common myth...

Being a CDL class A holder, NOTHING has changed.... Other than you MAY be seeing the new crop of drivers out on the road...

A lot of the older drivers have retired or just stopped because of the rules and regulations... A lot dropped when the E.L.D. ( Electronic Logging Device ) rules went into place last year ( I believe) ..

We just hired 2 new Class A drivers, right out of driving school and they for sure drive the limit, or slower....

In the NW, trucks still speeding and camping in the left lane... Sucks trying to get around them in heavier traffic. (not hauling myself)

I know we have a supply issue, but I see more large trucks on the road then I can remember in the past.

Have read some article about supply shortages and truckers want to throw out current regulations on hours they can drive. I see many independent truckers traveling at the truck speed limit. Company drivers have been following speed limits for some time.