The term 'Highway Hauler' refers to a professional driver who transports goods on highways. This job requires the use of a SEMI (4 letters), TRUCK (5 letters) or RIG (3 letters). The SEMI is a large tractor-trailer combination, the TRUCK is a large motor vehicle used for transporting goods, and the RIG is a large TRUCK with a trailer attached. Highway haulers are responsible for safely transporting goods from one location to another, often over long distances.