I complain about traffic congestion a lot, until I am reminded that compared to some parts of the world, America has it easy. I could not imagine living in Moscow or Beijing, where four-hour traffic jams are the norm. China faces an especially daunting task as their population continues to expand and urbanize; you can only build so many highways and move so many people, and building new train lines is expensive and requires extensive planning.
Unless… you put the train right over existing highways. That is what one Chinese designer is proposing. And I think the idea has a lot of merit… if only he can figure out how to get around existing overpasses.