What is required for a trailer or semi-trailer in case of breakaway from a vehicle?

For a trailer or semi-trailer, a properly functioning brake activation device is essential to ensure that if the trailer breaks away from the towing vehicle, it can stop safely. This device typically consists of an emergency brake system, which is activated when the trailer becomes disconnected.

When the breakaway occurs, the trailer's brake activation device is designed to engage the brakes of the trailer to prevent it from rolling away and causing a potential accident. This feature enhances safety on the road by minimizing the risk of the trailer becoming uncontrolled.

In contrast, while warning lights, manual override systems, and secondary safety chains may contribute to overall safety and are important in different contexts, they do not specifically address the immediate need to activate the trailer's brakes in the event of a disconnection. Therefore, the brake activation device is the key requirement for mitigating the risks associated with trailer or semi-trailer breakaways.