ACS Lite

How It Works

The diagrams below describe the physical connection of ACS Lite to a traffic signal system and the logic behind the systems operation. ACS Lite resides on a field hardened CPU that resides in the cabinet with the field master controller. A communications link between the field master and ACS Lite allows the software to monitor and evaluate traffic conditions and provide refinements to signal timing on a cycle by cycle basis.

ACS Lite utilizes a three levels of optimization to refine and update traffic signal timing. A Time of Day Tuner keeps timing plans updated by incorporating observations about traffic conditions into signal timing plans. A Run Time Refiner makes adjustments to real time signal timing on a cycle by cycle basis. The transition manager finds the methods of shifting between traffic signal timing plans.

Diagram describing the communications links between ACS-Lite and Intersection controllers.

Diagram describing how ACS-Lite uses a three tiered approach to schedule transitions, adjust active signal timing and update timing plans.

Search Operations: Arterial Management Home FOCUS AREAS Traffic Signal Management Traffic Signal Operations & Maintenance Signal Timing Access Management PRACTITIONER TOOLBOX Awareness/Outreach Publications Training & Workshops ACS-Lite Traffic Analysis Tools RESOURCES Arterial Management Team FHWA Resource Center Operations Team Links Contact Us	ACS Lite ACS-Lite How It Works The diagrams below describe the physical connection of ACS Lite to a traffic signal system and the logic behind the systems operation. ACS Lite resides on a field hardened CPU that resides in the cabinet with the field master controller. A communications link between the field master and ACS Lite allows the software to monitor and evaluate traffic conditions and provide refinements to signal timing on a cycle by cycle basis. ACS Lite utilizes a three levels of optimization to refine and update traffic signal timing. A Time of Day Tuner keeps timing plans updated by incorporating observations about traffic conditions into signal timing plans. A Run Time Refiner makes adjustments to real time signal timing on a cycle by cycle basis. The transition manager finds the methods of shifting between traffic signal timing plans.
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