Staff who have just a single drink at lunch time could become a menace on the roads, according to the latest research.
Researchers found a significant drop in people's ability to drive even after a small amount of alcohol.
A study by the Sleep Research Centre discovered that drivers enjoying a drink at midday were much more at risk than those who consumed alcohol in the evenings.
Scientists believe the combination of lunch-time drinking followed by a lull in concentration during the afternoon makes drivers far more dangerous behind the wheel.
The study found that alcohol consumption mixed with tiredness and a lack of alertness put drivers more at risk of crashing, even though they might be below the legal limit.