Ontario's seat belt law is turning 35. The law went into effect January 1st, 1976. Ontario was the first province to make it mandatory to buckle up and since then it's estimated seat belt use has saved more than 8,000 lives. OPP Traffic Sergeant Ken Mantey says fastening your seat belt is the most important thing you can do when you get into a motor vehicle. Nearly 93% of all Ontarians use seat belts; that's up from just 17% when the law came into effect. Mantey says he's perplexed by those who still don't take the simple precaution.