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After doing much research, I have discovered the safest day of the year to drive in America. Not only that, I have narrowed it down to the exact hour.

I compiled a list of all automobile accidents since 1975 and sorted them by day of year, then by time of day. Next I graphed the results, and I found that one hour of the year had a significantly lower number of accidents.

When was it, and why does this happen?

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The date is

The second Sunday in March

The time is

2am - 3am

Because

no time elapses due to daylight savings time

There were accidents reported, because

As Tony mentioned in comments, some states observe(d) it differently/not at all, plus DST is wonky in general.

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  • $\begingroup$ Correct answer, but can you tell me why there are some accidents in that time period? $\endgroup$
    – Daniel
    Commented Mar 31, 2016 at 0:30
  • $\begingroup$ Previously, Indiana did not participate in daylight savings. There may have been other states as well. $\endgroup$
    – Tony Ruth
    Commented Mar 31, 2016 at 0:32
  • $\begingroup$ Bingo. <!-- Can I put a comment in a comment? --> I guess I can't. $\endgroup$
    – Daniel
    Commented Mar 31, 2016 at 0:32
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Is it:

something to do with daylight savings time?

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  • $\begingroup$ You're thinking right, but you were 1 second too late. $\endgroup$
    – Daniel
    Commented Mar 31, 2016 at 0:30
  • $\begingroup$ Beats head on wall $\endgroup$
    – Parzival
    Commented Mar 31, 2016 at 0:32
  • $\begingroup$ Give me another try: puzzling.stackexchange.com/questions/29981/… $\endgroup$
    – Daniel
    Commented Mar 31, 2016 at 0:39

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