The national holiday road toll has climbed to 25, with the latest fatalities occurring in South Australia and Queensland.

A 19-year-old man has died after his quad bike and a four-wheel drive collided south of Gympie on Friday morning, taking Queensland's toll to three.

Later in the day, a motorcyclist died in a crash in the Adelaide Hills, with South Australia now recording four deaths.

In NSW, so far seven people have died this holiday season, with five of those deaths occurring on Boxing Day.

Last year, 13 people had died in NSW halfway through the same holiday road toll period.

There have been six fatalities in Victoria, four in Western Australia and one death in Tasmania. There have been no fatalities in the Northern Territory and the ACT.

The national road toll period runs from 00:01am on December 23 until 23:59pm on January 3, local times, in line with the Australia New Zealand Policing Advisory Board. AAP