Storm Ciarán: Flooding shuts major road between Horsham and Crawley
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Traffic had been struggling to get through deep water on the road all morning but the road is now said to be impassable.
There are traffic delays in the area.
Meanwhile heavy flooding is being reported in a number of other roads in and around Horsham.
Pondtail Road and Gorringes Brook are affected, along with Kerves Lane in Horsham, among others.
The A29 is shut in Church Lane, Pulborough.