You'd see less speeding on arterial streets if the traffic lights were timed to encourage adherence to the speed limit.  Proper timing of traffic lights reduces travel time and fuel use as well.  But, particularly in complex road networks, timing and volume interact often to everyone's disadvantage.  Better microchips, though, and traffic light aggravation diminishes.
Detectors at intelligent intersections are tracking traffic patterns, volume, and speed, all of which is routed to a city’s central traffic management system to be considered alongside detections from surrounding intersections.

The data gathered can unlock street grids, reducing congestion by self-learning from traffic patterns the intersections see on a daily basis. One of Siemens’s traffic management systems, TACTICS 3, marries data calculation and visualization, offering a traffic engineer or control center operator a way to search & filter for problem intersections. It works for street grids ranging from 30 intersections to 800.
If this sounds a little bit like centralized traffic control on the railroads, with a dispatcher or train director responding in real time to the progress of trains and setting signals so as to expedite their progress it does.  And note that "traffic engineer or control center" locution.  Information technologies provide information, perhaps in a fashion transparent enough that one does not require a masters in engineering to understand and respond in real time.  Perhaps such jobs will be ways to keep senior highway department workers employed indoors in bad weather.

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