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?


The date is

The second Sunday in March

The time is

2am - 3am


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.

  • $\begingroup$ Correct answer, but can you tell me why there are some accidents in that time period? $\endgroup$ – Daniel Mar 31 '16 at 0:30
  • $\begingroup$ Previously, Indiana did not participate in daylight savings. There may have been other states as well. $\endgroup$ – Tony Ruth Mar 31 '16 at 0:32
  • $\begingroup$ Bingo. <!-- Can I put a comment in a comment? --> I guess I can't. $\endgroup$ – Daniel Mar 31 '16 at 0:32

Is it:

something to do with daylight savings time?


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