Congestion and crowds build up faster than anyone's watching
A festival crowd doesn't turn dangerous in an hour - it turns dangerous in 90 seconds, once density crosses a threshold nobody's tracking in real time. Same story on the roads: a stalled truck at rush hour cascades into gridlock across six blocks before a human operator even notices the first backup. Cities need AI surveillance for smart cities that reads density and flow continuously, not a duty officer scanning 40 monitors between coffee breaks.