On Sunday night, May 9, the 46-year-old man was treated and stabilised at a property by paramedics and the Westpac Rescue Helicopter Service critical care medical team before being flown to the hospital.

Meanwhile, NSW police have urged motorists to take extra care on the roads, with several fatalities reported so far on the June long weekend.

Traffic and highway patrol command Assistant Commissioner Michael Corboy was saddened by the news.

"Motorists and motorcyclists need to remain alert, slow down, and always drive to the weather conditions. Not just during this operation, but every time they drive or ride," he said.

"Fatalities affect a whole community. It never gets any easier telling someone that their loved one won't be returning home."

Operation Stay Alert, a high visibility police blitz, will finish at 11.59pm tonight.

Double demerit points have been enforced throughout the operation, with police targeting speeding, mobile phone use, seatbelt and motorcycle/helmet offences, alcohol, drug affected drivers and fatigue.