A low bed semi-trailer is a type of heavy cargo vehicle specially designed for transporting heavy vehicles (such as tractors, large buses, special vehicles, etc.), rail vehicles, mining machinery, forestry machinery, construction machinery (such as excavators, bulldozers, loaders, pavers, freighters, etc.) and other heavy-duty cargo. It is characterized by a low center of gravity, which makes it more capable of transporting high cargo and passing overhead, while also improving stability and safety.