A lower drink-drive limit could come into force as officials examine the results of thousands of roadside breath tests across England and Wales where motorists involved in accidents had been drinking, but fell short of breaking the law.
Senior police officers support lowering the alcohol limit from 80 to 50 milligrams of alcohol per 100 millilitres of blood.
However, despite evidence that it could save up to 65 lives a year, last year ministers stepped back from lowering the limit.
The national lead for road policing, Gwent Police Chief Constable Mick Giannasi, said: "We think there is a case for reducing the limit because there remains confusion about what is acceptable. There are still people who say, 'I can have a couple of pints'. The truth is you can't because every drink impacts on your ability to co-ordinate your movements.
"The reality is alcohol affects everybody differently. There is no safe limit and the message is do not do it at all."
New digital breath testing equipment introduced from 2008 enabled officers to store details of every result.
Thousands of tests have since been downloaded to a central database for analysis by officials at the Department for Transport.
Copyright © Press Association 2009