Hunter Valley police are reminding motorists they could lose their licence or be hit with heavy fines if they do not obey the road rules this long weekend.

Double demerit points came into force this morning.

Highway patrol officer Senior Sergeant Tony Grace says police will be out in force in a bid to reduce the state's road toll.

"We basically target alcohol-affected drivers, speed and non-wearing of restraints, and fatigue as well," he said.

"If you've already got a couple of points on your licence, six points straight up for a seatbelt or a lower speeding offence, you could lose your licence in one hit.

"We put all our highway patrol vehicles on the road over this long weekend.

"We are definitely on the road and all about road safety."

Hunter police are urging motorists to be patient over the long weekend, describing Monday as a 'perfect storm'.

Traffic was already building up on the region's major roads yesterday, and the Transport Management Centre is warning it will be worse today.

Senior Sergeant Grace says motorists can expect delays with the busy holiday traffic.

"We just ask people to be patient, take their time and get to the destination as safely as possible," he said.

"Monday is a perfect storm so to speak, in that we get traffic coming back from the long weekend and from the school holidays.

"So we do ask that people delay their trip to Tuesday, where possible, but if they do choose to travel home on the Monday they can expect some significant traffic delays."