Puoliperävaunuja

Puoliperävaunuja, often translated as semi-trailers, are a type of trailer that utilizes its own weight and the weight of its cargo to gain sufficient traction for towing. Unlike a full trailer, which has its own front axle and is therefore fully supported by its own wheels, a semi-trailer lacks a front axle. Instead, its front end is supported by a fifth wheel coupling on the tractor unit. This design allows for a greater proportion of the trailer's weight to be transferred to the driving axles of the tractor, significantly increasing the combined vehicle's tractive effort.

Semi-trailers are a ubiquitous component of modern freight transport. Their design offers flexibility and efficiency, as a single tractor unit can be coupled and uncoupled from various semi-trailers depending on the cargo and destination. This adaptability is crucial for logistics and supply chain management. They come in a wide array of configurations, including box trailers for general cargo, flatbeds for oversized or irregular loads, tanker trailers for liquids or gases, and reefer trailers for temperature-controlled goods. The choice of semi-trailer is determined by the specific needs of the transport operation. The articulation between the tractor and the semi-trailer allows for relatively maneuverable operation, although turning radius considerations are important.