The drink-drive limit would be almost halved under plans adopted by the Scottish National Party.
Drink-driving has become increasingly taboo in society
A motion to cut the current limit of 80mg of alcohol per 100 millilitres of blood to 50mg per 100 millilitres was backed at the party's Perth conference.
The move would be in line with other European countries like France, Germany and the Netherlands.
It comes against a recent rise in drink-driving convictions among both men and women.
MSP Stewart Maxwell, who brought the motion, said research had shown that alcohol affected reaction time and co-ordination.
"When it comes to driving safely, two of the things you absolutely need are the ability to co-ordinate your actions and the ability to react in emergency situations."
The 80mg limit was introduced in 1966 and led to a change in attitude towards drinking and driving, but between 1999 and 2005 the number of women convicted for drink-driving rose by 65%.
"Men have seen their rates of conviction rise in the last few years as well," Mr Maxwell said.
He added: "Now is the time to recapture the initiative, to stop the rising drink-driving levels and to begin to drive them down once again."
Mr Maxwell's resolution won the overwhelming backing of delegates.
An attempt to have the limit reduced even further to 20mg per 100 millilitres was defeated.