The multi-agency Operation Dirt Runner cracked down on illegal trail bike riding and other driving offences along the popular stretch of beach and dunes yesterday.

During the seven-hour operation, a P-plater, 21, allegedly recorded a blood alcohol reading of 0.115, a 36-year-old man was charged with low-range drink driving and a disqualified driver was caught by police after a short pursuit.

Police handed out nine speeding fines, detected three 'registration offences' and gave out five cautions.

The operation included police from the Port Stephens, Newcastle and Lake Macquarie local area commands, the National Parks and Wildlife Service, Hunter Water and Port Stephens Council.

"Almost half of those breath-tested had some alcohol in their system, which is extremely disappointing," Inspector Dave Matthews said.

"Four-wheel-driving or riding a trail bike on Stockton Beach is already dangerous and adding alcohol to the mix increases the risk of an accident occurring exponentially.

"Given the results of this operation, there will be ongoing operations targeting these types of offences in these areas.''