Context: They are able to travel up and down the country on a regular basis but again they have no guarantee of a having return loads . There are too many vehicles on the road which are being run inefficiently and without back loads . For the first Christmas ever internet shopping has overtaken the high street .
Question: Why is it inefficient to run vehicles without back loads ?
Option 0: The loads you carry   on your back are not good .
Option 1: Carrying something back to someone is unstable
Option 2: It means the entire return trip there is nothing being carried - it wastes gas and time .
Option 3: None of the above choices .
Answer: 2