The operation was organised by the European Traffic Police Network (TISPOL) in 21 countries between 7 and 13 June and saw 422,181 drivers tested for both drink and drug driving. In total,  7,699 alcohol and 561 drug offences were detected.

Chief Superintendent Pasi Kemppainen, chairman of TISPOL's strategic alcohol and drugs working group, warned drivers about the risk of drink driving during the summer months: 'Summer is, for many of us, a time for relaxing and for parties with friends and family. But we urge people not to take any risks where alcohol and drugs are concerned. If you are visiting friends or heading out for a drink or two, then use public transport, get a taxi or nominate a driver who will not be drinking any alcohol.

'If you are staying at home, then please be a considerate host and don't put at risk the friend or family member with the car keys, by giving him or her alcohol. Measures of drink – especially spirits – poured at home tend to be a lot more generous than in bars.

'There is no quick way to sober up. Alcohol stays in your bloodstream for many hours, so be careful about driving the morning after a party. You may feel OK to drive, but you could still be over the legal alcohol limit, and therefore pose an unacceptable threat to your own safety and that of other road users.

'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.'