I don't think you are responding to what I wrote. I never suggested a one-size-fits-all approach. I don't think the 85th percentile rule is entirely bad, just

I don't think you are responding to what I wrote. I never suggested a one-size-fits-all approach. I don't think the 85th percentile rule is entirely bad, just not a "best practice", which sounds to me like "one-size-fits-all". The Strong Towns post I linked to said it makes sense for highways as I recall, which seems perfectly consistent with what you wrote. Anyway, to reiterate, I am still interested in knowing how frequently speed cameras and the like are used poorly. The only uses of speed cameras that come to mind in my experience were not on "controlled-access" roads and seem justified to me. In fact, I rode my bike several times on one road with a speed camera that many drivers whined about back when I lived on the east coast. It was not uncommon for people to drive 15 mph or more over the speed limit there, despite the pedestrians. If I recall correctly the speed camera was added before a pedestrian crossing. Edit: What I am recalling was actually multiple cameras on multiple roads. http://www.gazette.net/stories/12092010/laurnew185647_32536.php http://www.gazette.net/stories/12092010/laurnew185647_32536....