May 1, 2017

TRUE: Almost Every Speed Limit Is Too Low. “Traffic engineers believe that the 85th percentile speed is the ideal speed limit because it leads to the least variability between driving speeds and therefore safer roads. When the speed limit is correctly set at the 85th percentile speed, the minority of drivers that do conscientiously follow speed limits are no longer driving much slower than the speed of traffic. The choice of the 85th percentile speed is a data-driven conclusion—as noted lieutenant Megge and speed limit resources like the Michigan State Police’s guide—that has been established by the consistent findings of years of traffic studies. Yet most speed limits are set below the 85th percentile speed.”