What is the purpose of cargo securement devices like edge protection?

Answer: B — To allow the tiedown to slide freely under tension

The purpose of cargo securement devices, such as edge protection, is primarily to allow the tiedown to slide freely under tension. This is essential because when cargo is secured, it often moves or shifts slightly due to acceleration, braking, or turning. Edge protection helps mitigate wear on the tiedown straps or chains by providing a smoother surface for them to slide against, which increases their effectiveness in holding cargo firmly in place. Additionally, by allowing free movement, edge protection helps maintain tension on the tiedowns, ensuring that the cargo remains secure during transit. This aspect is crucial for overall safety and compliance with transport regulations.