However, this was not the case when cells were first used in the mid-1980s, when they caused a life-taking effect among pedestrians, drivers and passengers in vehicles. In those early days, when there were fewer than a million phones, fatalities increased, says Loeb, because drivers and pedestrians probably were still adjusting to the novelty of using them, and there werent enough cell phones in use to make a difference in summoning help following an accident, he explains.
The life-saving effect occurred as the volume of phones grew into the early 1990s, and increasing numbers of cells were used to call 911 following accidents, leading to a drop in fatalities, explains Loeb. But this life-saving effect was canceled out6 once the numbers of phones reached a critical mass of about 100 million and the life-taking effect - increased accidents and fatalities outweighed the benefits of quick access to 911 services, according to Loeb.
Loeb and his co-authors used econometric models to analyze data from a number of government and private studies. He and his co-authors recommend that governments consider more aggressive policies to reduce cell phone use by both drivers and pedestrians, to reduce the number of fatalities.
词汇:
crackdown n.制裁,严惩 outweigh v.超过 fatality n.死亡者 econometric adj.计量经济的
hypothesize v.假设,假定
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