At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll | Cheap Nursing Papers

At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll

At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll collector. What is the purpose of this wire?1 .

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