AAATHE 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  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)  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  highwaycodeuk.co.uk 45  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.  ● 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  ● reduce your driving ability, even if you’re below the legal  limit  ● affect judgement of speed, distance and risk  ● reduce co-ordination and slow down reactions  ● give a false sense of confidence 