Police are conducting a four-day roads operation from 12am Friday to midnight Monday, with speeding, mobile phone, seatbelt, and motorcycle and helmet offences among those attracting double demerit points.

Drink, drug, distracted and dangerous driving will also be in the sights of officers.

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"Our message is to be patient and obey the road rules in all conditions," operation commander Superintendent Stephen Hegarty said.

"There will be a number of cars on the road as people travel up and down the coast and inland, so we're asking everyone to be extra careful.

"Slow down and drive to the conditions."

He also said people who saw concerning behaviour on the roads should contact police or Crime Stoppers on 1800 333 000.

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The Transport Management Centre is again warning of high volumes of traffic through Albion Park Rail and along Lawrence Hargrave Drive in the northern suburbs.

Residents planning to travel over the long weekend are advised to visit www.myjourneynsw.info to find out forecast peak traffic times on their route.

Those heading to alpine areas should carry tyre chains, with more snow forecast to fall.

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