What must be done to ensure a secure coupling between a tractor and trailer?

To ensure a secure coupling between a tractor and trailer, it is crucial that the safety catch is properly positioned over the locking lever. This safety catch acts as an additional safeguard to prevent the locking mechanism from accidentally releasing while the vehicle is in motion. Even if the locking lever appears to be engaged, the safety catch ensures that the coupling remains secure under various driving conditions, including jolts or shifts in weight.

If the safety catch is not engaged, there is a risk that the coupling could come undone, leading to a dangerous situation on the road. Therefore, verifying the correct positioning of the safety catch is an essential step in the coupling process, contributing directly to vehicle safety and operational security.

While inspecting the locking lever is important, merely checking it does not provide the same level of security that ensuring the safety catch is engaged offers. Similarly, checking air pressure levels and adjusting trailer height are necessary for overall vehicle function but do not directly influence the security of the coupling itself.