The operation is co-ordinated by TISPOL, the European Traffic Police Network, said that the operation is intended to raise awareness of the dangers of driving under the influence of alcohol or drugs (both medicinal and recreational).

Chief superintendent Pasi Kemppainen, chairman of TISPOL's strategic alcohol and drugs working group, commented: ''We are increasingly focusing on drivers who have been taking drugs and who will fail to appreciate the increased risks they face, and the risks they pose to others. Many medicinal drugs can cause drowsiness and therefore impair driving, so it is vital that you, as a driver, should read the warnings on a medicine, or check with your healthcare professional, before taking any risks.'

A similar operation in 2010 saw more than 420,000 drivers tested in 21 European countries. In all, 7,699 alcohol and 561 drug offences were detected.