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Trees and debris fell down an embankment into the carriageway meaning the road had to be closed over the weekend.
The road was closed between Petworth and Pulborough on Saturday, with traffic diverted via the A272 and A29.
A West Sussex County Council spokesperson said: “Our first priority is always safety and the closure remained in place on Sunday so that the bank could be inspected by engineers.
“The engineers confirmed the embankment was structurally sound so it could be reopened under two-way lights on Monday afternoon (11 December). It was then fully reopened once a large tree stump was removed from the road that same afternoon. We would like to thank road users for their patience.”