The new laws mean drivers who blow between 0.05 and 0.069 will have their licence taken away for at least three months.

When their licence is returned, offending drivers will also be forced to have an interlock device fitted to their vehicle for six months.

According to the Transport Accident Commission, drivers’ skills begin to be affected and their ability impaired when the blood-alcohol level reaches 0.02.

The new laws will also see harsher punishments for drug-induced drivers.

People caught behind the wheel under the influence of alcohol or drugs will have to complete a behavioural program.

First-time drug drivers will also lose their licence for six months – an increase from three months – with repeat offenders forced off the road for a year.

Melbourne woman Karen Robinson was one of the people to welcome the new changes.

Ms Robinson’s 25-year-old son Ben died while drink-driving in Bendigo in 2009.

"Sadly, my son was a repeat road traffic offender, he had done that (drink- driving) many times over a 10-year period," she said.

Ms Robinson urged drivers who consider getting behind the wheel while affected by drugs or alcohol to stop and think.

"Think about your loved ones. You really don't want them organising your funeral. It's the worst thing that could possibly happen to your family," she said.

Drivers coming from interstate are also subject to the new measures.

"Everybody who is affected by drugs and alcohol will have the same rules apply, whether you're (on) a Victorian licence at the time or you're coming interstate and wish to get a Victorian licence," Roads Minister Luke Donnellan said.

Mr Donnellan also revealed the state government will continue investigate the possibility of banning all drivers from having alcohol in their system.

The minister’s consideration comes amid a crackdown on dangerous behaviour behind the wheel.

"We will do some further studies on that,” Mr Donnellan said.

"That's part of our road safety initiatives that we will look at those issues.”