I see this as a great boon for passenger cars, and of course, a bust for truck drivers.
I drive regularly on the Dallas-to-Memphis interstates. The many trucks there are a royal pain. Traffic runs relatively smoothly UNTIL I reach a truck driving a tenth of a mile faster than another truck that it is passing. This bottles up dozens of cars for sometimes as long as 5 miles, with another five to clear again. By the time the road clears, another such event occurs. Meanwhile, I will pass truck stops crowded full of trucks which have reached the mandatory driving time limits.
Just imagine how much faster everyone would go if the trucks were all going the same speed, leaving space between them for passing, with no mandatory drive time limits? Truck deliveries would be much-much faster, and passenger cars would be faster, and less frustrating as well.
Perhaps the truck traffic could be segregated onto dedicated rights-of-way. To keep them in those lanes even if they are hacked, some sort of steel guide rails could be installed on the truck roadways. Also, to increase the density of freight being hauled on these roads-with-rails, a number of trucks could be coupled together to make all of them run at exactly the same speed.
It's a bizarre concept, I know, but maybe someone will take a look at it someday.