This article continuously states that speed limit signs have little to no bearing on how fast people actually drive, and it says Lt. Megge is actually arguing this. If it has no bearing on how fast people drive, and changing speed limits actually doesn't affect the speed of traffic like they say in the article, why are they changing them? Why are they too low right now? Why does the 85th percentile matter at all? If people pay as little attention to speed limit signs as is mentioned in the article, wouldn't changing them have no effect on safety whatsoever - be it lower or higher, better or worse?