Three vehicles were in collision on the A47 Acle Straight in heavy fog this morning.
Police were called at 9.12am to the incident around two miles out of Great Yarmouth.
A car, lorry and van were in collision in the Yarmouth-bound carriageway, with debris in the road.
Officers said no injuries had been reported, but a rolling roadblock was in place with traffic at a standstill Yarmouth-bound.
The fire service was also in attendance.
People are advised to avoid the area if possible.
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