GoKawiilHow traffic signals actually optimize intersection flow, explained
This 2019 explainer breaks down how traffic signals manage competing streams of cars, bikes and pedestrians at urban intersections, describing them as the key bottleneck limiting a roadway's overall capacity. It draws an analogy between city road networks and human anatomy, showing how arterial roads rely on at-grade, signal-controlled intersections rather than ramps or overpasses to regulate right-of-way.