Discussion of 长途/長途 [cháng tú] long-distance - Trainchinese

Do I need to use any specific grammar when I use 长途? (chángtú) No, there is no specific grammar that needs to be used when using 长途 (chángtú) in its meaning of “long-distance“. It is a noun that can be used on its own or in a sentence as an attributive modifier modifying other nouns> It is common to use the structure “长途 + 的 + noun“ (chángtú de + noun). For example, 长途的旅行 (chángtú de lǚxíng) meaning “long-distance travel“. You can omit 的, for instance, 长途车 (chángtú chē) means “long-distance bus“ and 长途电话 (chángtú diànhuà) means “long-distance call“. Example sentence: 我们要坐长途车去北京。(Wǒmen yào zuò chángtú chē qù Běijīng.) - We are taking a long-distance bus to Beijing.

1 - 长途是否适用于正式或非正式场合？
2 - 使用长途时，是否需要遵循特定的语法规则？
3 - 存在哪些涉及长途的常见表达方式？