There are 4,114 Intersections in LA, and He Controls Them All
To judge by the level of congestion that the average driver confronts every day on the streets of Los Angeles, some might argue that Yu and ATSAC aren't doing a good enough job. But the Automated Traffic Surveillance & Control system (ATSAC), is adaptive, and as it builds a rich database of historical traffic statistics and patterns it is learning, so give it some time.
ATSAC was first implemented in 1984, the first such system in the country, and it proved itself quickly, despite what rush hour horror stories might tell you. "Repeated studies since the 1990s have found that travel times fall by 15% near connected signals and motorists make 20% to 30% fewer stops, massive improvements for a cost of about $150,000 per intersection. "