Buses, Coaches.

Even in the light of the recent coach crash in a Swiss road tunnel, very sad as it is. This is probably one of the most successful of human inventions. Buses are used world-wide and are to be found in all sorts of places cold and hot, wet and dry. Despite the many accidents that occur on mountain roads, they are still the best and cheapest way to travel from A to B. One of the latest inventions for the bus is the sliding side way Volvo coach. Much easier to park in urban environs, but still too expensive for many.  We today still have double decker's and now the bendy bus, love or hate it. but in eastern Europe there remains the trolley buses. What is the future I wonder in this century for the coach, bus?

Trams.

Are they worth their claims of improving metro systems or would buses just be good at doing the same job? 

Nearly every city and major town in the UK has a tram network of some kind. The question, should we have more of them or less? Is there the possibility of London having them again in the city center and what about trolley-buses and other forms of super metro/rail?