The maximum dimensions that a trailer can measure to circulate legally in Spain

In 2024, road freight transport in Spain will reach a total volume of 1.644 billion tons , representing a 2.6% growth compared to the previous year. In short, road transport is consolidated as the primary mode of freight transport in our country, providing a large number of jobs and representing a significant percentage of GDP .

For their part, trailers are the main vehicle in this sector, due to their large cargo space. However, they must comply with a series of regulations regarding the length and width of the combined cab and trailer.

What is the maximum width and length of a trailer?

Regarding the maximum authorized width, Spanish regulations establish a maximum of 2.55 meters , although they specify that it is possible to reach up to 2.60 meters for adapted vehicles, such as refrigerated vehicles. Regarding the maximum length, the law specifies that it must be 16.5 meters maximum for trailers, i.e., tractor units and semi-trailers.

In the case of combinations known as "road trains," such as a rigid truck plus a trailer, the maximum length is 18.75 meters . Finally, mega-trailers or duo-trailers have other legal dimensions.

What measurements can a duo trailer have?

Firstly, these vehicles are defined as an articulated freight transport unit consisting of a tractor unit and two semi-trailers , which are connected to each other by a device called a 'dolly', which is a mobile coupling platform that allows the secure connection between both trailers.

With the new DGT regulations now in force, dual-trailers can measure up to 32 metres in length and carry a maximum load of 72 tonnes , which can help alleviate the shortage of drivers in the sector and reduce polluting emissions, according to the International Road Transport Association (ASTIC).

What should we do if we come across a mega-truck? The DGT clarifies.

What license is required to drive a dual-trailer?

Unless otherwise specified by the Directorate General of Traffic, these vehicles may be driven with a C+E permit , which authorizes the driver to drive trailers in Spain. However, before obtaining this permit, it is essential to first have a C license, which authorizes the driver to drive trucks.

Likewise, to obtain a C+E permit, you must perform several maneuvers on a closed circuit. The first is the G maneuver, which involves reversing and making a 90-degree turn . Then you must complete the K maneuver, which involves parking safely to load or unload on a ramp or platform. Finally, you must perform the M maneuver, which requires coupling and uncoupling the trailer .