A line haul truck driver is a tractor-trailer driver who travels a set route through specified cities and generally returns home after each shift. In this career, you typically sort and handle your freight as you load and unload. You may deliver cargo to the same or similar places each time they drive, so you build relationships with these companies. You have many duties and responsibilities beyond those of other types of drivers, as you handle your own cargo and equipment. Line haul drivers, like all tractor-trailer drivers, must understand and follow DOT regulations during their runs.