HGV bans and other measures

I still like the idea of copying the maritime world and having Pilots- i.e. when an HGV crosses the boundary of the north or south circular they have to stop to pick up a pilot, who is (possibly) mounted on a motorbike/similar.

It then becomes the responsibility of the pilot to navigate the HGV to its destination, and, critically, the pilot would be responsible for any collisions en route.

Does the extra cost of having a pilot outweight the losses of human live?