This wildly misunderstands the nature of modern trucking. Trucks have many different roles, they're not just trains that don't need tracks. Trucks can work as on-demand transport, they can do low-volume, infrequent trips, they can aggregate and offload containers much easier, they're universally receivable at both ends with a minimum of infrastructure, etc. These autonomous trucks are competing with long haul human-driven trucks taking stuff from one depot to another, not short haul trucks.