Victoria's top traffic officer and the roads minister are at odds over a push to extend the zero blood alcohol limit to all drivers under 26.

Assistant Commissioner Doug Fryer used the 40th anniversary of the introduction of random breath testing in the state to start a discussion to widen the drinking ban.

"We know young drivers are at the highest risk on our roads and they are consistently over-represented in alcohol-related road trauma," Mr Fryer said today.

A mixture of inexperience and self-determined invincibility leaves them exposed and extremely vulnerable to road trauma, he said.

But Luke Donnellan said expanding drink-driving laws was not being considered by the government.

"Victorians rightly find drink-driving abhorrent and that is why the Andrews Labor Government recently tightened laws to deter people from getting behind the wheel while over the limit," Mr Donnellan said.

Any Victorian convicted of drink-driving is required to fit an interlock device and those caught with a blood alcohol content over 0.10 will also have their cars impounded on the spot.

In 2014, of the 468 injured drink-drivers tested in hospital, 31 per cent were aged under 26.