造橋指令，造橋費用每段為 2,000,000 

buildbridge north - 往北方建造橋樑
buildbridge south - 往南方建造橋樑
buildbridge east - 往東方建造橋樑
buildbridge west - 往西方建造橋樑
buildbridge west -d - 拆除在西方的橋樑