Trucker Exam Inc
How long does alcohol stay in your system?
Alcohol is broken down by the liver at the rate of approximately one unit per hour (a pint of normal strength beer being two units). Consequently, it is possible to still be under the influence the following morning if you have drunk excessively the night before. In fact, every year in Britain over 25,000 people lose their driving licenses the morning after a night's drinking.
To exercise caution, the following alcohol calculation can be used to estimate your level of risk after having drunk the night before.
1 Unit of alcohol = ½ Pint ordinary strength beer
1 standard glass of table wine
1 standard glass of sherry
1 single measure of spirits.
It is advised that you allow a minimum of 1 hour per 1 unit of alcohol consumed before driving or operating heavy machinery or electrical equipment in order to ensure that you are not under the influence of alcohol.
This simple formula will help:
Number of units drunk - Number of hours since last drink = Alcohol content
For example: A person drinks 6 pints of an ordinary strength beer (12 units) finishing drinking at 11pm. They start work at 8am the following day. (9 Hours later).
12 Units - 9 hours = 3. In this scenario, the person could still have 3-4 units of alcohol left in their body whilst driving to work the following day - risking both Police prosecution and the safety of others. 3-4 Units will bring most people to the UK and the US legal driving limit. Please exercise caution.