The collision occurred on Malthouse Lane at Hurstpierpoint College.
It has seen the road closed in both directions from the A273 Jane Murray Way to Chalkers Lane.
Queues form in the area.
AA Traffic News reports that the accident was first reported around 5pm this evening.
Sussex Police have been contacted for comment.
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https://www.theargus.co.uk/news/22823787.delays-malthouse-lane-due-crash-near-hurstpierpoint-college/?ref=rss Delays at Malthouse Lane due to an accident near Hurstpierpoint College