It always bears repeating that the safest way to drive involves no alcohol. However, in answering how many units are over the limit, it is generally estimated that the drink-drive limits in England, Wales and Northern Ireland would allow men the equivalent of 4 units of alcohol. This is around two pints of normal-strength beer.  On the other hand, women may be able to drink three units of alcohol and remain under the limit. This is about one large glass of wine or a little more than a pint of regular-strength beer.