Even if we accept that the number of accidents on the highways of Forestville did increase, the author still fails to convince us that the increase could be exclusively attributed to the change in speed limit. There are many other factors that can result in more accidents. For example, it is possible that after the change took effect, the highways in Forestville have been much more heavily used than ever before and it is therefore not strange that the number of accidents increased. It is also possible that the increase of accidents is due to some changes in climate. Without ruling out these possibilities the author could not draw a sound conclusion.
In addition, the analogy drawn between Forestville and Elmsford cannot give strong support to the authors conclusion that it is the different speed limits on highways that give birth to different accident numbers. There is no information concerning the similarities and differences between these two regions. It is not impossible that these two region vary dramatically in climate and terrain. It is common sense that climate and terrain are closely related with accidents. Thus the analogy drawn between Forestville and Elmsford is unconvincing.
Last but not least, six months may not be long enough to guarantee the reliability of the statistics cited by the author. Maybe drivers need a longer period of time to get accustomed to the change in speed limit on highways. Maybe most car accidents occurred in winter and the six months used for statistics happened to include winter. Thus the statistics cited by the author are not so cogent. Perhaps the author could find the accident number on the highways of Forestville remains steady or even falls throughout a longer period of time.
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