Argument 13 - Prunty County

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13) In an attempt to improve highway safety, Prunty County last year lowered its speed limit from 55 to 45 miles per hour on all county highways. But this effort has failed: the number of accidents has not decreased, and, based on reports by the highway patrol, many drivers are exceeding the speed limit. Prunty County should instead undertake the same kind of road improvement project that Butler County completed five years ago: increasing lane widths, resurfacing rough highways, and improving visibility at dangerous intersections. Today, major Butler County roads still have a 55 mph speed limit, yet there were 25 percent fewer reported accidents in Butler County this past year than there were five years ago.
Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would weaken or strengthen the argument.
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提纲初稿：
Specific evidence about the change of the number of cars in Prunty County compared to last year, the change of the number of cars in Butler County compared with five years ago, and the specific number of accidents in Butler County this past year.
First of all, the change of the number of cars in Prunty County should be known because the number of cars may have increased considerably while the number of accidents has not decreased, which means the accident rate has decreased.
In addition, the change of the number of cars in Butler County compared with five years ago is also very important because 25 percent fewer reported accidents may be the result of less cars.
Finally, the specific number of accident in Butler County is important evidence since many accidents may have not been reported.

讨论笔记：
要关注的是事故率
受伤率、死亡率的变化
意外中可以通过increasing lane widths, resurfacing rough highways, and improving visibility at dangerous intersections减少的事故有多少