As a form of mass transit, buses are certainly an eco-friendly option, but the amount of space they take up and the traffic they cause offsets some of those green benefits -- this has spurred China to conduct trials on their elevated buses, the TEB-1s. The elevated buses have existed as concepts for years, but these tests are the first time that they have actually been put to use in practice.
The buses are behemoths: they measure 22 meters long, nearly eight meters wide and crucially, they are nearly six meters high, with nearly half that height devoted to creating a "tunnel" under which regular cars can drive. Though the elevated buses' max speed would only be about 60 km/h, the ability to allow two lanes of traffic underneath them means that their speed won't interrupt the flow of traffic.
Though the trial run was very limited, only taking the TEB-1s across 300 meters of controlled track, the buses could revolutionize transportation once unveiled on city streets.