Since the car only lands on a single wheel, it is not necessary to choose the width of the road surface, so narrow roads, roadways, ridges and wooden bridges can all pass through. This is very suitable for the production and transportation in the tea area. It is also called "line car" because it is a single wheel and the traces left on the ground are straight lines or curves.

The wheelbarrow is commonly known as "Jigong", "second in command" and "dirt cart". It is distributed in many parts of the country. Before the popularization of modern means of transportation, it was a light vehicle for carrying goods and people. Especially in the north, it played almost the same role as the donkey.