回复：跟电车火车一样弄成几节就可以了

even 弄成几节, it still needs a very large circle to turn. Think about that, its width is almost 3-lane wide.
The bus supposes to server in the city, now the land price is so high, (>10K/m^2 for the apartment in high-rise building), the building usually has 20-30 floors, you can estimate the price for land.