medium · LSAT Logical Reasoning

A city official claims that the city's newly installed traffic lights have reduced accidents by 15%. It is later discovered that the total number of cars on the road also fell by 15% over the very same period.

The discovery about traffic volume most undermines the official's claim because it:

  1. supplies an alternative explanation for the decline, since fewer cars on the road would tend to produce fewer accidents regardless of the lights
  2. demonstrates that the new traffic lights were even more effective than the official first believed
  3. shows that the new traffic lights are what caused drivers to abandon the roads
  4. establishes that traffic volume and accident counts have no relationship to one another
  5. proves conclusively that the new traffic lights had absolutely no effect on safety

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