LADOT runs one of the most advanced signal systems in the Country. Dating back to the 1984 Olympics, LADOT staff invented technology to automatically adjust signal timing to more dynamically move traffic. The Advanced Transportation System and Coordination (ATSAC) Center uses real-time detector loops between and at intersections, and changes the signal timing as traffic conditions change. Engineers see graphical representations of traffic conditions, are automatically notified when traffic conditions are abnormal (which could be the result of a crash, police or fire emergency, etc.), and can visually observe conditions using cameras installed at major intersections. ATSAC also supports LA Metro to move its trains and buses faster. 

LADOT continues to make advancements in ATSAC to keep traffic moving. Representatives from the following groups can request a tour through our contact page:

• Credentialed media
• Recognized/official transportation organizations

Local Universities: Student organizations and transportation-related programsGovernment: City departments, Council offices, and local agencies City-Affiliated Groups: Ad hoc commissions, neighborhood councils, and chambers of commerce with business directly related to the City Official Delegations: Visiting dignitaries and representatives from other US cities.

Learn More About ATSAC

Figures estimate benefits of ATSAC, compared to a system without automated signal control.