What would likely happen if a driver fails to test the trailer emergency brakes before driving?

If a driver fails to test the trailer emergency brakes before driving, it is crucial to understand that the primary risk is related to the functionality of those brakes. Emergency brakes are designed to engage automatically if the trailer detaches from the towing vehicle, ensuring safety and preventing accidents. Without testing these brakes, there is a significant risk that they may not function properly when needed. This can lead to a dangerous situation where the trailer could become uncontrollable, posing a threat not only to the driver but also to other road users.

Testing the emergency brakes is a fundamental part of pre-trip inspections to verify that all braking systems are in working order. Proper functionality is essential for maintaining safety, especially when dealing with heavy loads typically found in trailer transport. Therefore, the importance of this step cannot be overstated, as it directly impacts the overall safety and reliability of a commercial vehicle operation.