The first driverless semis have started running regular longhaul routes

A little bit of an aside but I watched some people deploy an autonomous underwater vehicle. It was an uncomfortable feeling watching it ($100K+) drive away and then sink under the water.

I can only imagine watching your 15000 pound simi drive onto the highway.

Article doesn't say but I wonder if the autonomous portion is interstate only and for the "last N miles" a driver is needed?