No, it’s neither…or both. The Dutch are developing a project called the SuperBus which, World’s Fair-esque hyperbole aside, looks like an interesting approach to sustainable public transport solutions. Able to switch between running on normal roads and special tracks, the bus is aerodynamic and hence needs only a ‘modest electric motor’ to reach cruise speeds of 250kph. Add one door for every passenger, and you have an attractive sounding package. The demo version is slated to see the light of day at the Beijing Olympics in 2008 – if it doesn’t sink through lack of funding.