A day long breath and drug test operation, conducted on May 12 on the Oxley Highway near Widderson Street, failed to detect any drink drivers, but did result in a drug driving detection. 

It does not mean people are getting the message about road safety, with alcohol, speed and drugs remaining the main cause of road trauma in NSW.

Highway Patrol Sergeant Paul Dilley said large operations will continue to run, with advancements in technology and more equipment – such as drug detection kits – arriving shortly.

"During the operation, we conducted over 100 drug swipes with one person detected with a presence (of a drug). That sample has been sent to Sydney for analysis," he said. 

"Of the 1300 random breath tests conducted we received all negative results. It was a very high profile activity that will continue to be complemented by mobile activity."

There were six general duty police on site during the operation, aided by a random drug testing vehicle, working 8am to 4pm. 

"These operations will be conducted on a random basis with additional equipment coming in the near future," Sgt Dilley said.

"It means additional operations will be conducted on the Mid North Coast as well as the mobile random tests that currently happen. It can happen anytime anywhere.

"Technology is improving (but) there's continued major concern that alcohol, speed and drugs are among the highest contributor to road trauma in the state. 

"Reducing the road toll is our main focus and alcohol, speed and drugs are our key areas of focus."