The NSW road toll has hit eight this long weekend, with motorcyclists accounting for half of those who have lost their lives.
The latest road deaths came in a triple fatality at Maules Creek, in the state's north-west.
Emergency services were called to a single-vehicle crash on Glencoe Road, 41km east of Narrabri, about 12.20pm Sunday, after a vehicle left the road and rolled.
Three of the occupants – an elderly couple and their son – died at the scene. Their ages are not yet known.
A 15-year-old boy was airlifted to Tamworth Hospital with non life-threatening injuries.
Officers from Barwon Local Area Command have attended and established a crime scene.
An investigation into the circumstances surrounding the crash is underway and a report will be prepared for the Coroner.
The Maules Creek accident follows a string of motorcycle accidents earlier in the weekend. A 60-year-old man died on the Kings Highway, near Braidwood, in the state's south-east, on Saturday night.
The accident happened on the Clyde Mountain, when the man's motorcycle left the roadway and hit a concrete barrier at about 8.20pm. He died at the scene.
Earlier a motorcyclist crashed while travelling north on the Princes Highway, near Tom Uglys Bridge, Blakehurst.
Emergency services attended about 3.30pm and took the man, believed to be in his mid-50s, to St George Hospital. He died a short time later.
On the state's north coast, police are investigating a fatal crash on a dirt track near Palmers Road, Lake Macquarie.
About 2.15pm on Saturday emergency services were called to bushland at Freemans Waterhole where a bike rider had lost control and hit a tree. The 21-year-old Beresfield man died at the scene.
Meanwhile about 11pm on Friday, a 53-year-old man riding his motorcycle east on Fallon Street, North Albury, lost control on a bend. The man crashed into a fence and died at the scene.
The fifth fatal accident involved a 19-year-old man whose vehicle left Raymond Terrace Road, Millers Forest, crashed through a fence and rolled a number of times before coming to rest in a paddock early on Friday morning.
Investigating police believe speed was a major factor contributing to this crash.
Police say an increase in speeding offences was recorded in every region across NSW.
“It’s disappointing that despite our many warnings, more than 1200 road users were detected speeding in the first 24 hours of Operation Slow Down,” Acting Traffic and Highway Patrol Operations Commander, Acting Superintendent Mark Cook, said.
“No deadline is worth dying for,” A/Supt Cook said. “We continue to urge anyone using our roads this weekend to stay within the speed limit, take regular breaks, drive to conditions, and ensure everyone in the car is properly restrained.
“We also remind people that it is illegal and dangerous to drink and drive, or to use hand-held electronic devices while behind the wheel – so for your own safety, please don’t.”