I'd not thought of that, although it seems eminently possible. The more connected road vehicles become, the larger their attack surface, and so far manufacturers have not been speedy in updating the software/firmware in the vehicles.
Google had their car hacked in America.
Ocean going ships, well yes (though crewed by more than two), but what barges can take thousands of tons?
What wheeled vehicle can take thousands of tons, in one go on a road?
Proof of concept stuff has been bubbling under for years, and lots in ordinary cars - manufacturers don't do simple things like separating the entertainment (and so outward facing) communications channels from the internal control stuff, so once you're in, it's possible to do some real damage - and they don't have any way to patch often enough to keep up with threats. Unless things have improved hugely since I last read up on the subject, it's likely to be an issue.
Big national carriers would have most to gain, someone like Stobarts or any outfit with national distribution centres? Something like a platoon leaving a depot at the same time via motorway, then peeling off as individual loads get to their exits, then same sort of thing on the way back?
The people who use the cars are exactly the same people who walk and cycle - and their parents and their children. There is not a "car-using" population that is mutually exclusive from the "non-car-using" population.
The biggest problem is the number of exit/entry points on the motorways. A fact that was behind the choice of the northern half of the M6 being chosen for the trial.
The majority I was referring to clearly also walk and may also cycle - but they prioritise driving (flag for crossover to "short driving journeys" thread). They will support further restrictions on walking and cycling on carriageways rather than see their right to make unimpeded progress as a motorist restricted.
From some of the last second diving into gaps I've seen to make a sliproad that'll only work if the gap is less than a car length.
