One of two south-bound lanes on Pennant Hills Road near Evans Road at Carlingford will remain closed for most the day following a water main bursting about 6.15am (AEST).
Traffic is heavy in the area.
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Yesterday a cast iron main ruptured beneath Moore Park Road at Paddington in inner Sydney resulting in tens of thousands of litres of water gushing onto the street.
On Tuesday, another water pipe burst in the Cross City Tunnel causing CBD traffic chaos.

