A tried and true approach

Canada's campaigns against drinking and driving have won points for effectiveness in a study conducted at the University of Regina.
Compared with four other English-speaking countries that conduct similar campaigns, researchers discovered that Canada's campaigns are working because they do more than preach.
Canada's campaigns warn about the harm of drinking and driving but also provide ideas for alternative behaviours and offer opportunities for drinkers to take preventive measures both before and after enjoying some social cocktails.
The research discovered that Canada's ads are more diverse, with messages against drinking and driving presented in various formats, and with different focus and emphasis to catch the attention of several demographics.
There is evidence that the Canadian campaigns are successful: the fatality rate related to drunk driving has dropped to 2.61 per 100,000 population. In the United States, the fatality rate is 4.54 per 100,000 population.
Canada's messages are toned down in comparison to the ones used in New Zealand where the statement is bold: "If you drink then drive you're a bloody idiot." While the premise is absolutely right on the money, obviously the boldness is not well-accepted by New Zealanders who might be offended by the brash tone and the attack on one's personal intelligence.
Being hit by a verbal two-by-four does the job momentarily but when the pain is gone, the message is quickly forgotten.
Because Canada's method seems to be working, that's a message to Canadian agencies to keep its focus on that style of campaign, and to other countries to try our approach.