The study looked at how heavy trucks affect roads in Rhodesia. They found that the current weight limit of 80 kilonewtons is enough and doesn't need to be increased. Even though trucks can be big and heavy, the roads can handle them well. The researchers used economic analysis to show that it's better to have smaller loads on each axle. This helps keep the roads strong and saves money in the long run. The study was updated in 1974 to check if anything had changed, but the results stayed the same.