Re: It must be us old fogeys with no perception of speed or distance
Convoy slipstreaming behind an "18-wheeler"?
Clearly only in America... I think that's the only place the big lorries have the same motorway speed limit as the cars. It really won't fly in the UK when you can SARTE and get there an hour later per 200 miles than in "manual".
Yes, it'll save a lot of fuel - but driving at 50 insteads of 70 saves most of that fuel anyway, and nobody does it.
Aside from the technology barriers, are you really going to wait for one of those to come along before starting your journey? Of course not! If you're happy to wait for a scheduled journey, you'll take a real train or a plane and hire a vehicle at the other end.
The technology needed to do this is a useful stepping stone to cars that drive themselves on motorways, but don't kid yourself that consumers will ever do it.
HGVs might, though. Many of them already slipstream anyway, I'd rather a computer was doing it.
The whole concept is a very scary thought for other road users though - getting safely on or off at a junction could be made very difficult by one of those formations.