What is used to stop the trailer if it comes apart from the tractor?

• A. Breakaway Cable
• B. Conventional Bomb Chock
• C. Shackles
• D. Chaff and flare modules

Answer: (A)

When the trailer becomes detached from the tractor, a breakaway cable triggers the trailer’s emergency braking system. This safety link connects the trailer to the tractor, and if separation occurs, the cable pulls a switch that energizes the trailer brakes, applying them full force to stop the trailer quickly and prevent a runaway. The mechanism is designed so the trailer can’t continue uncontrolled even if it’s no longer tethered to the tractor.

Other items listed aren’t relevant here: a conventional bomb chock isn’t used for towing safety, shackles are for securing loads, and chaff and flare modules are countermeasures for aircraft. The breakaway cable is the dedicated device to stop the trailer if it comes apart.