<p>That’s an interesting study, Erin’s dad. I thought it was intriguing that in the 55-to-65 switch, fatalities initially went up, and then down. Is this, an initial spike followed by decreasing fatalities, a pattern? And to what limit would it apply? Also, I can’t help but doubt that a 5 MPH difference in speed limits made such a large difference in fatalities. Really, on Iowan interstates, I (anecdotally, of course) see people drive between 3 and 8 MPH above the limit as it is, and I am not bereft of samples; I live in Eastern Iowa and have all my life. What I mean by all this is that I don’t know that one should accept these figures to be causal without something of a grain of salt.</p>