Why are they making it so needlessly complicated? They can just use existing highways and vehicles with Level 4 self-driving. They don't need new separate roads.
That said, this points to the future. Even if true Level 5 self-driving is several years off, there is plenty Level 4 can do now. That includes all cargo driving on highways. I doubt most trucker jobs have long to go. Some will say they are needed for last-mile delivery. Some companies are soon going to figure out a profitable system for having human drivers locally for that, but self-driving vehicles for the long stints on highways.