Officers from Wollongong Police District and the Traffic and Highway Patrol Command will be focusing on high-risk driver behaviour including drink, drug, dangerous and distracted driving.

"Road safety is always a priority, but even more so on long weekends when we see more people travelling throughout our region," Supt Evan Quarmby said.

Double demerit points will be in place until midnight on Monday, April 5 for speeding, seatbelt, mobile phone and motorcycle helmet offences.

Meantime, drivers are being urged to plan ahead before travelling over the long weekend, with several roads still closed across the state in the wake of recent wild weather.

Minister for Transport and Roads Andrew Constance said maintenance crews were still fixing roads that were seriously damaged during flooding in the past two weeks.

"We know people will be travelling around the state this long weekend, so we need everyone to plan ahead and check the Live Traffic and NSW SES websites before taking off on their journey," Mr Constance said.

"Due to the large number of slips and inaccessibility of some areas it is likely that some road closures will be in place for several weeks. People should check ahead if they're preferred route is impacted and adjust their trips accordingly.

"We know COVID-19 has sidelined many people's travel plans over the year and that people will be excited to get out on our roads and waters, but safety must come first.

"Due to the large amount of debris still circulating in the river system, a temporary speed limit of 15 knots will apply from Thursday for all waters west of the Hawkesbury River Rail Bridge at Brooklyn on the Hawkesbury River, the Nepean River and their tributaries."

Minister for Police and Emergency Services, David Elliott, said there is no excuse for bad behaviour on our roads over the holiday period.

"Many communities throughout the state are still dealing with the effects of devastating flooding and it is important nobody adds to the heartache," Mr Elliott said.

"Double-demerit points are in force for a reason and Police officers will be stationed across NSW targeting high-risk behaviour."