At $40,000 a year, the incentive to replace truck drivers with software is massive. And it will happen. Not only that, but insurance costs will drop. Most truck accidents are caused by user error: Driving too fast, driving while tired, driving intoxicated, etc.
Robots don't drink, don't get tired, won't drive unsafe to get to a destination faster,
Think of all the fun hackers could have with trucks driven by software.