And then we have the whizz kid who comes up with a program that intercepts the signals sending trucks all over the motorway. I can just imagine IS and it's cohorts saying bring it on.
That is something that will have to be addressed, and will, I have no doubt. I may be they go for something like an optical style link, where by the only way to interfere with the signal is to get precisely in line with it. Who knows. At the moment it is all just research, hence drivers in the cab, just in case.
Regarding trains, the idea with autonomous trucks of the future (and autonomous cars) is that individual trucks, from individual companies, heading for different destinations can platoon up on the motorway saving energy and space. The autonomous cars will do the same, all heading into the centre of the city in a platoon, then separating to go to their final destination.
I find it strange that an old man, like me (in my 70th years), can see the possibilities that improving technology brings, and where it could all be leading us. I think some of you must have worked for Kodak, at the turn of the century.