The issue in warehouses is that even before talking about control software behind automating, we simply don't have hardware for manipulators that are as versatile as human hands. That's why top of the line automated warehouses have sort of converged on automating everything except stations where humans can act like task reconfigurable pick and place machines. Better manipulators than biological hands is still an open research problem.
Automated cars don't have the hardware barrier, and as soon as the control software meets the required error rates, we should expect a rapid switchover to automated fleets.
When people hear that term they think of the robots that amazon installed that move product around the building for you and massive conveyor systems like UPS has for sorting packages. While those kind of machines are getting better and are slowly making their way into "smaller" companies (i.e. not the size of amazon) the biggest changes are on the ERP and data management side, tbh.
Cheap/plentiful handheld devices and robust/cheap wifi tech has been a game changer for us compared to the physical processes of using paper to direct staff on the floor. The processes we used 10-15 years ago are night and day to what we use in 2022, at least in my mid-sized fulfillment company.
As in, a significant % of tractors are without human drivers, or as in, a significant % of tractors with human drivers have GPS-based assistance?
I live in a rural area and see several dozens of tractors every day, and FWIW, I've never seen a tractor without a human driver. Yet.
Millions of jobs will be lost within a few years.
And your comment didn't address of where these drivers will go in any way. "Adapt" is not an answer. Your average 46 year old truck driver will not be learning Javascript.