Editor's note: This is Part 2 of a three-part series. See Part 1.Last time we looked at why so many American traffic engineers continue to install vast and expensive signal arrays on virtually every urban intersection -- even those that are small and insignificant, and even though most of these signals work poorly at best.It's a pointless and wasteful practice, and doubly so in this era of tight civic budgets. But don't take my word for it -- ask the exceptionally clear-headed traffic department in Arlington, Va.: "Installed under inappropriate conditions, a traffic signal is ineffective, inefficient, and a potential danger to motorists and pedestrians. Signals that are installed when no legitimate need exists often generate an increase in vehicle stops, traffic delays, f...
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