What is drop-and-hook in semi-trailer freight operations?

Drop-and-hook is a trailer exchange method in which a tractor unit uncouples from a loaded semi-trailer at a delivery or staging terminal and immediately couples to a pre-loaded trailer for the next leg. The semi-trailer's landing gear holds the front section stable while uncoupled. On high-frequency European freight corridors, drop-and-hook eliminates tractor waiting time during loading and unloading, reducing the cost of operating dedicated road freight lanes.

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What Is a Semi-Trailer?