In China, plans are underway to begin construction of 115 miles of track that will house a huge bus, called the 3D Express Coach, that drives above the cars on the road. It will carry up to 1400 people and take only a year to complete. With construction slated to begin at the end of this year, commuters in Beijing will soon be traveling along in eco style -- the buses will be powered by both electricity and solar power.
The widening and increased height of the busses means that roads don’t need to be widened which means there will be no congestion from construction.
There are quite a few projections of what the busses will look like here.