Editing Road train (section)

=== Mexico ===
In Mexico road trains exist in a limited capacity due to the sizes of roads in its larger cities, and they are only allowed to pull 2 trailers joined with a pup or dolly created for this purpose. Recently{{When|date=May 2019}} the regulations tend to be more severe and strict to avoid overloading and accidents, to adhere to the federal rules of transportation. Truck drivers must obtain a certificate to certify that the driver is capable to manipulate and drive that type of vehicle.<ref name=":0">{{Cite web |date=11 November 2014 |title=NORMA Oficial Mexicana NOM-012-SCT-2-2014, Sobre el peso y dimensiones máximas con los que pueden circular los vehículos de autotransporte que transitan en las vías generales de comunicación de jurisdicción federal. |url=https://www.dof.gob.mx/normasOficiales/5512/sct11_C/sct11_C.html |url-status=live |archive-url=https://archive.today/20230516064135/https://www.dof.gob.mx/normasOficiales/5512/sct11_C/sct11_C.html |archive-date=16 May 2023 |access-date=16 May 2023 |website=[[Official Journal of the Federation (Mexico)]] |language=es}}</ref>

All the tractor vehicles that make road train type transport in the country (along with the normal security requirements) need to have visual warnings like;<ref name=":0" />

* "Warning Double Semi-Trailer" ({{Langx|es|Precaución Doble Semirremolque}}) alert located in the frontal fenders of the tractor and in the rear part of each trailer,
* yellow turn and warning lights to be more visible to other drivers,
* a seal for the entire vehicle approving the use as double semi trailer,
* federal license plates in every trailer, dolly, and tractor unit.

Some major cargo enterprises in the country use this form to cut costs of carrying all type of goods in some regions where other forms of transportation are too expensive compared to it due to the difficult geography of the country.<ref>Notice of regulation https://www.elmananerodiario.com/los-doble-remolque-no-se-prohiben-tendran-regulacion-mas-estricta/</ref>

The Mexican road train equivalent form in Australian Standard is the A-Double form, the difference is that the Mexican road trains can be hauled with a long distance tractor truck.