Frustrated police fear drink-driving warnings are not getting through after two motorists were caught with high readings within three days this week.
Sergeant Patrick Day from Koroit police said one driver was almost three-times the legal limit and a second close to double when pulled over and tested.
"It's disappointing that the message isn't getting through to our local people," Sergeant Day said.
"At the start of July we processed a local Koroit resident for nearly three times the legal limit after being caught in the main street and now we have another two local people who wanted to take the chance, three drink drivers in Koroit this month already."
A 35-year-old Koroit man was almost three-times the legal limit when caught late Wednesday driving an unregistered and unroadworthy vehicle in the township.
His car was impounded for 30 days, licence immediately suspended and will appear in court at a later date.
That came after a 67-year-old Koroit and district man was nabbed almost twice the legal limit in Kirkstall on Monday night. He has been disqualified from driving for six months.
Koroit police are searching for a driver of a black Holden Commodore which did not stop at 3.08pm on the Koroit-Mailors Flat Road.
Police clocked the car travelling at more than 150km/h.
"It was last seen turning right at Caramut Road, heading towards Warrnambool. We are interested in any witnesses, dash-cam footage or information," Sergeant Day said.