[andymc]

Ah yes, I see it now. Interestingly, I remember reading some time back about how a single Tesla HGV with just one driver can lead a line of semi-autonomous HGVs which are electronically/wirelessly connected to the lead vehicle, following close enough to slipstream all the way along the convoy. When the driver of the lead vehicle brakes/accelerates, the entire convoy brakes/accelerates to the same degree. It's essentially a road train that can be e.g. 10 semis long. The cost of transporting goods like this is apparently less than the cost of transporting an equivalent amount by rail.