Police pulled her over at the outskirts of Maryborough, on a road heading towards Talbot overnight.

The woman aged in her 50s was immediately served a notice of licence suspension and will front court at a later date, Maryborough Acting Sergeant Richard Jane said.

"We always recommend people choose a designated driver when they go to parties and functions," he said.

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The intercept was not part of Operation Amadeus, the police program addressing the causes of fatal and serious injury collisions.

However, it happened as police rolled out the operation across rural Victoria.

Another person expected to face court is a man in his 40s who was caught allegedly travelling 47km over the speed limit in Long Gully, and who police say tested positive to a preliminary drug test.