Drivers faced delays of more than an hour this afternoon after the A40 Witney Bypass was closed in both diections.
The closure was caused by fallen power cables and emergency repairs on the bypass between the B4022 junction and the A415 Ducklington Lane.
Electrical engineers are on scene.
Long queues built up both ways approaching the closure, and there are reports of severe delays on the diversion route through the middle of Witney.
Police also say several sets of traffic lights in the area are out of order as a result.
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