However the rate has been about the same in the past 20 years. Why is this ? Please help :)
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There are probably a few likely reasons. For one, the population has increased as well as the driving population, more cars on the road then it is more likely there will be accidents and possibly fatalities. Additionally, advances in automotive safety are not increasing at the rate they once were. For example seat belts, airbags, and anti lock brakes were big advances that have saved many lives and had a profound affect on safety. The advances made in the past 10 to 20 years have not had as great an affect as those features. I guess you could say the current advances being made are only incremental changes or additions to technology that has been around for 20 years.
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The rate dropped as safety improved. However, as safety has improved further improvements are difficult. Also as the population has been increasing congestion tends to make accidents more likely.