Correct answer
To prevent the coupling bar from touching the ground if it becomes detached, and to allow a certain degree of control over the trailer to be retained.
They keep the coupling drawbar off the ground and allow some residual control of the trailer. They are not an electrical earth connection or an anti-theft system. Distinguish them from a device that automatically applies the trailer brake on separation. The General Vehicle Regulations require a secondary coupling on trailers with a maximum authorised mass of no more than 1,500 kg that lack a system ensuring braking if the coupling breaks. This does not permit driving with a faulty main coupling.
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To earth the electrical system.
To prevent the coupling bar from touching the ground if it becomes detached, and to allow a certain degree of control over the trailer to be retained.
To prevent unauthorised use.
The real exam in English is a translation of the Spanish original; compare both here.
Show the Spanish original
Un remolque lleva cadenas de seguridad como acoplamiento secundario junto al enganche principal. ¿Qué función cumplen si se separa ese enganche?
- Impedir que la barra de acoplamiento toque el suelo en caso de desenganche y permita conservar un cierto control del remolque.(Correct answer)
- Impedir su uso sin autorización.
- Conectar la masa del sistema eléctrico.
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