Which condition defines a "breakaway" for trailers and semi-trailers?

A "breakaway" condition occurs when a trailer or semi-trailer becomes detached from the towing vehicle. This situation is significant because it can lead to serious safety risks on the road, including uncontrolled movement of the trailer. The definition aligns with safety regulations designed to prevent accidents caused by trailer detachment.

In this context, a breakaway system is typically incorporated into trailer designs to address this potential hazard. When the trailer detaches, the system activates to safely halt the trailer, preventing it from rolling away and posing a danger to other road users. Understanding this definition is crucial for proper safety measures during towing, emphasizing the importance of securely coupling the trailer to the towing vehicle.

The other conditions listed do not meet the criteria for a "breakaway" event. Loss of hydraulic pressure, a flat tire, or any shift in weight distribution may cause operational or handling issues but do not involve the trailer separating from the vehicle, which is the critical factor in defining a breakaway situation.