The leak was first reported at 7.49am on the A259 near the Dell roundabout in Peacehaven.
Long traffic jams have formed on South Coast Road off Sutton Avenue.
Temporary lights are currently operational while teams work to repair the main line.
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https://www.theargus.co.uk/news/20294183.burst-water-main-causing-traffic-delays-a259-peacehaven/?ref=rss Burst water main causing traffic delays on the A259, Peacehaven