The back of a truck with a rusted trailer hitch and broken tail light can be seen in the photo.

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The multi-part accident involved two school buses, a GMC pick-up truck and a truck-tractor with no trailer.

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Each serves about 120 stores, and most of them have assigned a shipping dock to every store, with a truck-trailer parked waiting to fill up for a run.

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Equipping the trailer of a truck with a large, standardized, removable box required nothing more than a stroke of imaginative brilliance.

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Ford also showed off a vision of how its popular F-150 might evolve, with the Atlas truck concept, featuring helpful technologies like a trailer backup assist.

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The bus was in collision with a sedan car and a pick-up truck pulling a trailer, Mr Lopez said.

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