In Vietnam, Highway #4 itself is not just a single continuous path but a network of strategically important routes that wind along much of the length of the Sino-Vietnamese border. It is divided into Highways 4A, 4B, 4C, 4D, 4E and (with no letter F in Vietnamese!) 4G as follows:
- 4A > Dong Dang – Na Sam – That Khe – Dong Khe – Cao Bang (118km)
- 4B > Lang Son – Loc Binh – Dinh Lap – Mui Chua port (107km)
- 4C > Ha Giang – Yen Minh – Dong Van – Meo Vac – Highway #34 (216km)
- 4D > Muong Khuong – Lao Cai – Sa Pa – Tam Duong – Pa So (200km)
- 4E > Kim Tan (Lao Cai) – Pho Lu – Bac Ngam Junction (46km)
- 4G > Son La – Song Ma (90km)
This main route services the north of the country, linking major urban centres throughout the mountainous regions, passing through undoubtedly some of the most stunning scenery in South-East Asia. These rural areas have long been famous for hosting a variety of forest produce used in traditional medicine and the soaking of traditional liquor.