Superintendent Bob Noble said Operation Chrome saw more than 29 extra officers deployed on Friday and Saturday night.

"There were over 600 random breath tests conducted, 72 traffic infringement notices were issued and four individuals were arrested on 13 various charges," he said.

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"It was a fairly successful operation in the sense that there were no serious prangs, but still this level of offending is fairly concerning."

Superintendent Noble said there were two drink-driving charges and three drug-driving charges.

"With only 12 drug tests conducted, a hit rate of 25 per cent is still concerning," he said.

"It shows, perhaps, for some people the message has not really sunk in."