Driver need to collect a load in Manchester where would he pick up a second man and then drop him off, Would he drop him off before he loads or does this second man stop with him until he leaves Manchester then were does he drop him off,,Then the driver is to deliver in Birmingham he picks up yet another second man so he can deliver into Birmingham does this second man wait with him? Anybody who knows haulage this could be hours or does the second man walk back to where..
The driver then needs to go back to base in Liverpool yet another second man..Who is paying for all these second men that would be needed for every HGV entering a town or City..
Do not want to sound glib but its not economically feasible.
but killing lots of cyclists pedestrians is economically OK? Basically that means it's still being paid for, but not by the haulage industry but by the victims. Economists term is "externalities" where the cost is not being born by those benefitting.
Bear in mind if the law said haulage industry has to do this or that, it would simply have to comply and the costs would not actually be born by the industry but passed on to its customers. It's a bit like the bollocks argument hauliers made for cheaper fuel. They are competing with other hauliers who have to buy the same fuel after all.
Of course, this is rather begging the question of whether a 2nd observer would be of benefit, but the principle of "not economically viable" simply means that someone else has to pay for the collateral damage.
None of this means cycling up the inside of a truck is remotely wise. And not cycling up the inside doesn't stop left hooks nor pulling in whilst towing a long trailer after half-overtaking either.