We looked at studies from Australia and Europe that examined what happened when legal limits were lowered to 0.05 in Australia and in European countries. The studies were looking at collision fatality rates and using econometric analyses that controlled for things like alcohol consumption levels in the population and other known factors that affect collision mortality rates--weather conditions and so on.
In those studies, what they found was that when the legal limit was lowered to 0.05, there was a 6% to 18% reduction. The range of reduction was 6% to 18% in fatality rates. That's where that range comes from of between 185 and 555 deaths prevented if we apply that to Canadian roads.