What is the requirement for the connection between vehicles when towing?

The requirement for the connection between vehicles when towing is that it must prevent unintentional uncoupling. This is crucial for safety, as a secure connection ensures that the towing vehicle and the towed vehicle remain coupled during travel. An unintentional uncoupling can lead to hazardous situations, such as the towed vehicle swerving or becoming detached altogether, which can pose a danger not only to the driver but also to other road users.

While other types of connections might have their own specific advantages, such as flexibility or weight considerations for ease of handling, the primary focus here is on safety. The connection mechanism must be designed to withstand forces encountered during driving, including acceleration, braking, and turning, which requires a robust and reliable coupling method.