Queueing traffic and road closed due to accident, three vehicles involved on A23 Southbound at A273 (Pyecombe), congestion on A23 to B2118 (Hurstpierpoint / Sayers Common Turn Off). Police on scene.
One lane blocked due to accident on M23 Northbound between M23 J9 (Gatwick Airport) and J8 M25.
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The Duchess of Cambridge has been driven to St Mary's Hospital in London in the "early stages of labour", Kensington Palace has said.
The Duchess of Cambridge has been on maternity leave since the week before Easter.
The Duke and Duchess of Cambrige have been together for 15 years and will have three children under the age of four.