Trailers

Like dump trucks, tractor-trailers (a.k.a. semi-trailer truck) require special driving skills. These are articulated Lorries that consist of a towing engine (the cab) and one or several trailers that actually carry the cargo load. A tractor-trailer is almost similar to a freight train in that a cab tows behind it several trailers much like a train does along railroad tracks. Popular brands in America are the Mack, Ford, Freightliner, Kenworth, International and Peterbilt. These are designed for long-distance hauling and are sturdily engineered to carry big loads. Drivers are likewise to possess class-A licenses to be qualified to handle these types of trucks. An important part of the practical examination to obtain a license is the proper use of air brakes. If they fail this particular section of the exam, they would not be issued a license. Due to terrorist threats, drivers of trailers are subjected to background security checks since some of these cargoes are highly combustible and could potentially be used for terroristic intents.

Drivers of small trailers are also referred as “LTL” drivers or less than truck load. The trend now is to use only a single but wider tire per axle as opposed to the previous double-tires configuration. Its advantages are lesser total truck weight which saves on gas and the single tire covers less area of the braking system which allows faster cooling. Of course, once a flat tire occurs, there is no backup.