RoSPA is urging other parts of the UK to consider lowering the drink-drive limit after publishing a response to the proposal in Scotland.
Experts estimate that a 50mg limit would save between 77 and 168 lives a year in England and Wales, which could increase to as many as 300 lives annually by the 6th year.
The Scottish Government's consultation paper suggests that a lower limit could save as many as 17 lives a year on Scotland’s roads.