The latest Orange Book flags a shortage in truck drivers that driving up freight prices.
So Elon Musk agrees, and comes with a solution:
"As you alluded to, there is a really serious shortage of truckers. So, there just aren't enough people who want to drive trucks, which are crucial for transport throughout America. So, an autonomous Semi is actually going to be very important to address the shortage of truck drivers. And also will be great for improving safety and making it easier on truck drivers to have a self-driving Semi is going to dramatically improve safety and comfort for truck drivers that use the Tesla Semi."