The World’s Longest Bus. The AutoTram® Extra Grand demonstrates a future-oriented technology for public transport. As an intermediate public transport vehicle, it combines features of conventional buses (e.g. high flexibility, low infrastructure costs and moderate life cycle costs) with the advantages of trams like high transport capacity, driving comfort and the possibility of partial emission-free operation. The multi-unit vehicle with rubber tires is more than 30 meters long and has a capacity of 256 passengers.
For more see: http://www.autotram.info/en.html