We thank Eric Teoh for his creativity, rigor, and effort in analyzing factors important to highway safety. We agree that traffic risks fluctuate substantially, as measured by the numbers of people in fatal motor vehicle crashes each day over the last three decades in the United States. One reason relates to weekends and holidays, which have about a 30 increase in risk compared to other days. Such fluctuation was our rationale for identifying an exact day for each year, because tax deadlines are never scheduled on a weekend or holiday (and thereby avoid such fluctuation). We wish we had made this point more clearly.
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