The Hunter Expressway, New England Highway and old Pacific Highway are all closed due to flooding and fallen trees.
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The Transport Management Centre is urging motorists to suspend all non-essential travel in the adverse weather conditions.
The New England Highway, just north of the junction of the Golden Highway, is closed, but a detour is in place via Range Road and the Golden Highway.
The Hunter Expressway is now closed between Wine Country Drive and New England Highway in the Hunter region due to flooding.
The old Pacific Highway is closed between Calga and Somersby due to fallen trees.
On the trains, the Newcastle and Central Coast line has a limited service operating on the Central Coast & Newcastle Line between Woy Woy and Central..
On the Hunter rail service, the line is closed between Hamilton and Scone and Hamilton and Dungog due to flooding at Hexham.
A limited bus services is now operating on those lines, but passengers are advised to allow additional travel time for their journey.
More than 250 sets of traffic signals are currently blacked out with the Central Coast, Hunter and Sydney's northern beaches worst affected.
Linesmen around the state are working to restore power to more than 200,000 customers who've lost electricity.