What are your thoughts on autonomous cars? They are unmanned ground vehicles 
I find them interesting, but a little frightening.
They can detect their surroundings, and use radar. I'm interested in where the driverless car technology goes.
They will certainly be used to replace truck drivers
You mean a person who earns their living as the driver of a truck? I agree, but I don't see any reason that shouldn't stop us. Driverless trucks will likely still need a custodian to ride along.
Yes.      Delivery trucks that drive long distance will require much less effort.
Yeah but one of the benefits could be a reduced total infrastructure cost.
True.     Hacking of those systems might also be an issue.