既可表示可數也可以表示不可數。表示交通這個大概念時為不可數名詞。eg. the government invest a lot to improve the transportation。表示不同的交通方式時為可數名詞。
拓展
transportation和traffic的區別
traffic主要指交通（狀況）即流動中的車輛或行人。如Many residents in beijing are likely to welcome efforts to improve traffic;transport 是具體意義上的運輸、運送。如He often has boxes of samples to transport / Transport (交通工具）has long been scarce;transportation是抽象意義上的運輸。如Even the transportation networks are maintained by farms.另transport是可數名詞，transportation是不可數名詞。
