[peteretep]

Level 4 includes autonomy in the "operational design domain (ODD)" of a vehicle. I'd have thought that on a tollway that's being maintained specifically to support some self-driving trucks that the difficulty of Level 4 is a few orders of magnitude easier than cars in a residential district.

[flamedoge]

Maintaining tollway for self-driving is still going to add to "manually helping" cost. The operational domain of a vehicle includes roads of varying conditions that a human driver can navigate with relative ease.

[PeterisP]

The operation domain of general purpose consumer vehicles includes all roads of varying conditions that a human driver can navigate with relative ease, but the operation domain of e.g. an EU long-haul truck company can be easily limited to a set of pre-mapped highways.

Manual handling of problem cases that can be done from a central dispatch center would still require far less people to deliver the same cargo than now.