blood. In Scotland the legal limits are lower. You MUST NOT drive with a breath alcohol level higher than 22 microgrammes/100 millilitres of breath or a blood alcohol level of more than 50 milligrammes/100 millilitres of blood. 

Alcohol will 

● give a false sense of confidence 

● reduce co-ordination and slow down reactions 

● affect judgement of speed, distance and risk 

● reduce your driving ability, even if you’re below the legal limit 

● take time to leave your body; you may be unfit to drive in the evening after drinking at lunchtime, or in the morning after drinking the previous evening 

The best solution is not to drink at all when planning to drive because any amount of alcohol affects your ability to drive safely. If you are going to drink, arrange another means of transport. 

Law RTA 1988 sects 4, 5 & 11(2) 

96. You MUST NOT  drive under the influence of drugs or medicine. For medicines, check with your doctor or pharmacist and do not drive if you are advised that you may be impaired. 

You MUST NOT  drive if you have illegal drugs or certain medicines in your blood above specified limits. It is highly dangerous so never take illegal drugs if you intend to drive; the effects are unpredictable, but can be even more severe than alcohol and result in fatal or serious road crashes. Illegal drugs have been 

