Southern Highlands Police are pleased with the majority of driver behaviour over the June long weekend.
Operation Stay Alert began on midnight June 7 and ended at 11:59 pm June 10, with police breathalysing more than 7700 motorists in the Hume district during that time period. Twelve people were charged with drink driving.
Under the new laws, anyone caught drink driving will automatically lose their licence for three months and receive a fine.
Five motorists were fined for not wearing a seat belt, a further 305 people were fined for speeding offences and 145 people received penalty notices for other offences.
These figures come a day after four car crashes happened along the Hume Highway as people headed home after the long weekend.
Inspector John Klepczarek said that it was fortunate that those accidents were not too serious and reminded motorists to be vigilant on the road.
"We can't give up on road safety and we won't," he said.
"Do the wrong thing and the chances are, you'll get caught."
Over the course of the long weekend there were four fatalities in separate incidents across the state, with three occurring in the southern parts of NSW.
Traffic and Highway Patrol commander assistant commissioner Michael Corboy said the weekend resulted in several fatal crashes, where vehicles left the road and hit other objects.
"While the causes of all the crashes on the weekend are still under investigation, I would encourage all drivers or riders to be aware of their surroundings and take breaks if they are tired," he said.
"It doesn't matter where you are travelling to - crashes do not discriminate. They can happen anywhere and at any time."