National Road 4 is a major highway in Vietnam that connects the capital city, Hanoi, to the northern provinces. It plays a crucial role in facilitating trade and transportation, linking urban and rural areas. The road is vital for local economies and supports the movement of goods and people. The highway spans approximately 200 kilometers and features various landscapes, including mountains and rivers. It is an essential route for travelers and commercial vehicles, contributing to the overall development of the region. Improvements and expansions of National Road 4 have been ongoing to enhance safety and efficiency.