A driver was treated in hospital after his car hit a telegraph pole and flipped onto its roof near East Grinstead.
The crash happened on the A22 London Road at 1.45am today.
The Vauxhall Zafira reportedly brought down power cables and ended up on its roof.
A man from Wiltshire was freed by firefighters and taken to Kent and Sussex Hospital in Tunbridge Wells.
Anyone with information is asked to call Sussex Police on 0845 6070999 quoting Operation Northbrook.
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