argument18

18The following appeared in an editorial in a Prunty County newspaper.

"In an attempt to improve highway safety, Prunty County recently lowered its speed limit from 55 miles per hour to 45 on all major county roads. But the 55 mph limit should be restored, because this safety effort has failed. Most drivers are exceeding the new speed limit and the accident rate throughout Prunty County has decreased only slightly. If we want to improve the safety of our roads, we should instead undertake the same kind of road improvement project that Butler County completed five years ago: increasing lane widths and resurfacing rough roads. 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."

1.大部分的驾驶者超过新的速度限制，事故率的略微降低有可能是因为这项措施适时的时间还不长，而并不是这项措施无效。

2.B和P城市的公路环境，驾驶者水平存在着许多的不同，所以不具有可比性，不能通过单纯的照搬B的措施来提高高速公路的安全性。

3.B城市去年的交通事故率比五年前降低了25%，这个比率只是报告的事故，有可能很多事故并没有被报告。

4.45和55是否是唯一的两个选择，有可能选择其他的速度会产生好的效果。