On Tue, 18 Aug 2015 05:16:33 -0700, trader_4 wrote:

I and others have pointed out that the campaign that has dramatically
lowered drunk driving has occurred over roughly the same period that
cell phone usage grew dramatically.

I responded to that post of yours which assumes that the drunk-driving
campaign exactly cancels out the skyrocketing cellphone ownership
effect on accident rates, in both timing and in number.

It's far-fetched to believe that both the timing and the size of
the drunk-driving campaign results *exactly* cancel out that of the
cellphone driving effect, but it is one possible answer to the conundrum.