The real issue is Alaska DOT failing to set speed limits at the 85th percentile speed.  All honest traffic engineers know that the 85th Percentile speed is the most beneficial limit at which to travel.  Our speed limits are intentionally set too low, I believe, to maximize revenue and further the myth that speed kills.  Just ask the Commissioner of Highways in Texas; he increased the speed limit twice in Texas after conducting required traffic speed studies.  Nice guy.