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The primary safety and security concerns are preventing accidents and controlling congestion. Today’s traffic management systems are reactive rather than preemptive, making them less effective than they could be. When a local transportation agency becomes aware of an accident or other problem, an operator must manually change the signal patterns to ease traffic flow in other directions or create a detour. But by the time the problem has been reported, the flow of traffic has already been interrupted, affecting safety, mobility, commerce, and air quality.
Today’s traffic signal controllers are also a source of recurring costs.