ATSAC Citywide Adaptive Traffic Signals
This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.
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Built in-house for the 1984 Olympics with 118 signals, it took until February 2013 to synchronise every signal in the city. Roughly 4,850 are connected now, with AI upgrades going in ahead of 2028.
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The strongest source is the operator's or the city's own reporting — an official report, dataset or press release. It grades who did the looking — not how well the project went. All four grades →Part of 1001 Smart Cities — 1,167 documented projects · 🏙️ 12 more in Los Angeles · 🚦 Traffic management guide · 🚲 Mobility projects
LADOT's in-house traffic-signal system, first deployed for the 1984 Olympics with 118 signals, now connects roughly 4,850 signals through 26,000+ sensors and around 620 cameras. Los Angeles finished synchronising every signal citywide in February 2013 — one of the first major US cities to do so. A newer adaptive module (ATCS) and AI upgrades retime signals ahead of the 2028 Olympics.
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📎 Cite this project
1001 Smart Cities (2026). “ATSAC Citywide Adaptive Traffic Signals” — Los Angeles, United States. The Smart City Atlas. https://1001smartcities.org/projects/la-atsac/ (last verified 2026-07-17). Data: CC BY 4.0.
The underlying data is free to reuse with attribution — see the open data page.