Here is an interesting project being developed by Elon Musk that is called the Hyperloop Project. The Hyperloop Project involves using tubes full of compressed air to propel a capsule through the tube at near sub-sonic speeds. Being heralded as the Concorde of the future of logistics the Hyperloop Project would solve alot of problems with cargo transports in cities like Los Angelos where cargo is delayed because of traffic jams.
The Hyperloop even if only used as a means of cargo delivery between points would also reduce greenhouse gases emitted by the vehicles that would be otherwise sitting idle on the highway.
The Hyperloop would also create alot of new jobs which is always a good thing.