A police officer on patrol came across the crash, which blocked the A170, just after 1pm.
A car and a van were hit by the trailer which police understand became detached from a tractor travelling in the opposite direction because of a mechanical failure.
One driver was checked over by paramedics at the scene as a precaution.
Officers arranged for the damaged vehicles to be recovered and for the road surface to be cleared up.
The road was blocked following the collision and reopened at 3.20pm.
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