This comes months after Opposition leader Michael O'Brien announced that the Liberal Nationals would bring drug driving penalties into line with those applicable for drink driving.

When sentencing a drug driving offender earlier last week, magistrate Frank Holzer sitting in Warrnambool again expressed his frustration.

"There's a gap in the legislative regime where drug drivers don't have the same consequences as drink drivers and I really hope that situation changes," he said.

Fifty-nine more Victorians have tragically lost their lives on the state's roads compared to the same time last year, but drug drivers are also now more prevalent in road deaths than drink drivers.

Mr O'Brien said the State Government had taken too long to act.

"Too many lives have been lost. Daniel Andrews must act urgently on calls from the Victorian judiciary to increase the penalties for drug-driving in Victoria, he said.

"Every day that Labor fails to toughen penalties for drug-driving, the lives of Victorian motorists are at risk," he said.

Tuesday last week: Weak drug driving penalties are putting the community at risk and frustrating magistrates, but Premier Daniel Andrews continues to do nothing, according to a south-west MP.

For the fourth time, a magistrate in Warrnambool has vented frustrations about not being able to jail repeat drug drivers.

On Monday, while sentencing a repeat offender, magistrate Franz Holzer was clearly frustrated.

"There's a gap in the legislative regime where drug drivers don't have the same consequences as drink drivers and I really hope that situation changes," he said.

It's the second time Mr Holzer has made comments about the weak drug driving penalties and he is the third magistrate in Warrnambool to express such views.

Opposition spokeswoman on rural roads and member for South West Coast Roma Britnell backed the calls.

"At a time when we have a road toll rising out-of-control and when more people who die on our roads are found to have drugs in their system than alcohol, Daniel Andrews and Labor continue to ignore the pleas of magistrates who are telling him over and over again these laws are flawed," she said.

"Mr Andrews and Labor instead have ripped billions of dollars out of the TAC and cut roadside testing.

"On the other hand, the Liberal Nationals have a plan to ensure penalties for drug driving are brought in line with those for drink driving and to increase roadside drug tests by 1000 per week."

Ms Britnell said that under Mr Andrew the road toll was skyrocketing.

"We know that drug driving is playing a part in that. Mr Andrews must listen to the magistrates who are warning the penalties for drug driving need to change," she said.

"While the premier sits on his hands and fails to address this ongoing problem, the Liberal Nationals have a policy to send a strong message to the community that driving while under the influence of drugs will not be tolerated," she said.

Earlier: Persistent drug drivers continue to take risks on our roads with a repeat offender losing her licence for 12 months after she was caught driving high on cannabis.

Sasha Poole, 23, of McGregors Road, pleaded guilty in Warrnambool Magistrates Court on Monday to failing an oral fluid test.

She was caught driving in Warrnambool with cannabis in her system on March 11.

The court heard it was not the first time the woman was caught driving with drugs in her system.

Magistrate Franz Holzer said the woman was foolish.

"(Drug driving) is really risky. If I'm driving at the same time as you, or anybody else in this court room, we're at risk of your foolishness," he said.

"Do you care if you kill him, her, me? Because you should."

Poole said she had booked an appointment at the Western Regional Alcohol and Drug Centre in the hope of overcoming her cannabis addiction.

Mr Holzer disqualified Poole's licence for 12 months, stating it was disappointing he could not incarcerate drug drivers.

The magistrate often speaks of the legal loophole that prevents magistrates from jailing drivers for failing an oral fluid test.

"There's a gap in the legislative regime where drug drivers don't have the same consequences as drink drivers and I really hope that situation changes," he said.

Offences with a higher evidentiary burden, including driving under the influence, driving while impaired, and combined drink and drug driving, carry terms of imprisonment ranging from three to 18 months.

The Standard last week reported south-west police were concerned about the high number of drivers getting behind the wheel under the influence of drugs.

Hamilton police manned a road block and conducted just 12 drug tests, catching four drivers under the influence of drugs.

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