But all in all that thing occupies a substantial width, especially once you include realistic clearances. If it is supposed to be any good in dense traffic, you pretty much have to keep cars out of that space for the most part (just as with the tram). It seems that it should be enough space to accommodate a tram track - proven technology that is potentially interoperable with the railway network and has modest curve radiuses. It is true that you reuse more surface area with those buses, but you would need an awful lot of them to take full advantage of that.
