Police said they were called at 10.34am to reports of a delivery lorry driving into the entrance of Dereham Hospital that had caught the trailer on overhead cables.
The lorry caused no damage to the phone lines, which were lying across the drive, however the pole which held the wires up has been pulled at an angle.
Fire service were on the scene to provide safety, and the road reopened by 11.45am. The cables are now safely covered and access to the hosipital is as normal.
Temporary traffic lights will be installed on Northgate so that workers can rectify the issue on the roadside.
No one has been injured in this event.
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