Is Every Speed Limit Too Low?
Of course, this is all based on a single study from the 1960's (Solomon, David, "Accidents on main rural highways related to speed, driver, and vehicle"), which has been pretty thoroughly debunked (<a href="http://casr.adelaide.edu.au/ruralspeed/RURALSPEED.PDF" rel="nofollow">http://casr.adelaide.edu.au/ruralspeed/RURALSPEED.PDF</a>).