A road has been closed in Swinton due to flooding.
The A6 is shut in both directions where Chorley Road feeds into Manchester Road.
Water has flooded the road and damaged the tarmac.
Photographs taken at the scene show huge cracks in the road surface.
One passer-by said the road looked like it could collapse.
Andrew Olsen, 53, said: "There's water everywhere. It's obviously a burst water main.
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"About 15-16metres of the road surface has cracked and been lifted by the water.
"It looks like it could collapse at any minute. It's not the first time it has happened either.
"It flooded along here not so long ago."
Transport for Greater Manchester Tweeted: "Travel update: A6 Manchester Road, Swinton is closed at the junction of Chorley Road in both directions due to flooding. Please find alternative route."
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