On August 15, 2011,the Ministry Publish Security   started a campaign   to educate drivers about the dangers of driving after drinking. As a part of the campaign, police officers watched bars, restaurants and KTVs in Beijing, Shanghai, Liaoning, Jiangsu, Zhejiang, Hubei and Guangdong. It ended up on December 30. But it told the drivers the meaning of the new traffic laws and the dangers of drinking. In Beijing, some restaurants put up notices and told drivers about their responsibility. "Usually if a group of guests come by car, the driver won't drink. If he does, we will remind him," said a waitress from Dongfang Restaurant in Beijing. Fewer drivers are drinking alcohol nowadays, since many know about the campaign. Wang Lankun, a traffic policeman in Beijing said, "Some drivers think a glass of beer is not a problem. But a blood test will show that their blood-alcohol level is more than 20mg for each 100ml of blood, that is enough to affect their driving." During the campaign, drivers who have a blood-alcohol level of over 20mg for each 100ml of blood will get a fine of 500 yuan. Also, they will not be allowed to drive for three months. In fact, there are strict laws to punish drunk driving in many other countries. For example, in the USA, if someone has a blood-alcohol level of over 80mg for each 100ml of blood, he will be sent to prison for one year. But in Britain, he will be fined 5,000 pounds and banned  from driving for 12 months, also he will be sent to prison for 6 months. In Germany, if a driver has a blood-alcohol level of over 60mg for each 100ml of blood, he won't be allowed to drive until he passes a new driving test. How long did the campaign last?
For about half a year. For about four and a half months. For about 12 months. For about three months.