multitrailer

A multitrailer refers to a road vehicle combination consisting of a prime mover (tractor unit) towing two or more trailers. This configuration is also known by various terms depending on the region, such as road train in Australia, B-double or B-triple in other parts of the world, or simply a multiple trailer combination. The primary purpose of using multitrailers is to increase the total payload that can be transported in a single trip, thereby improving transport efficiency and reducing costs.

The design and configuration of multitrailers vary significantly. A common type is a B-double, which involves a prime mover pulling two semi-trailers. More complex configurations can include a B-triple, with a prime mover towing three semi-trailers, or even longer road trains with a lead trailer and multiple rigid trailer units attached. The specific regulations and permissible lengths and weights for multitrailers differ by jurisdiction, often due to infrastructure limitations and road safety considerations.

Multitrailers are typically used for long-haul freight transport, particularly for goods that do not require immediate delivery. Their use is prevalent in countries with vast distances and relatively uncongested road networks, such as Australia and parts of North America. While offering economic advantages, the operation of multitrailers requires specialized driver training and careful handling due to their increased length, weight, and reduced maneuverability compared to single-trailer combinations. Safety concerns, including braking distances and stability, are paramount in their design and operation.