Should we also have a transportation worker's bill of rights, that sets the reasonable output that one can expect from a human? Would it be reasonable to set that rate based on what a human can deliver on foot, unassisted by any vehicle?

The whole point of a tool is that it increases the amount of output we can expect from workers. Otherwise we'd still all be doing agriculture, because the farmer's bill of rights sets the maximum output of a farm and there's not enough surplus for non-farmers.