A man has been dealt 33 demerit points in a single stopover in Sydney's south-west after police say they found five unrestrained children in his van.

After pulling the van over for a random breath test at Woodbine on Saturday morning, officers said they noticed an 11-year-old girl unrestrained in the back and a three-year-old who was not in an approved baby seat or wearing a seat belt.

After a closer look police said they discovered another three children — aged 4, 6, and 8 — also unrestrained underneath a blanket on the floor of the van.

The 38-year-old was dealt a traffic infringement notice for each unrestrained child and an extra one for a defective seatbelt offence.

Due to double demerits for the Easter period, the total was brought to 33 points — enough to have his driver's licence suspended more than twice over.

In a separate incident later that afternoon police officers pulled over a woman in Moree in the state's north and issued her with 24 demerit points after they said they found four children unrestrained in her vehicle.

In a statement Assistant Commissioner Michael Corboy said motorists should not be putting passengers at risk.

"People need to be accountable for unsafe driving practices, whatever they may be," he said.

"The reality is they are not only putting the lives of themselves and their passengers at risk but also others travelling on NSW roads."

The incidents come after a woman on the state's central coast was dealt 28 demerit points on Easter Monday after police allegedly noticed her using her mobile phone while driving and found three unrestrained children.

Since last Wednesday 5,599 infringements have been issued and there have been six fatal crashes on NSW roads.

Over the Easter long weekend 10,177 infringements were issued and there were three deaths on the state's roads.