An intelligent traffic signal system has 4 core modules that work together. Understanding each helps with system design and troubleshooting.
The 4 Core Modules
1. Detection Module
The detection module gathers traffic data:
- Inductive loop detectors (vehicle counts and classification)
- Video detection (AI-based, multi-lane)
- Radar detection (weather-resilient)
- Pedestrian push buttons and sensors
- Connected vehicle data (when available)
Ask GAOQIAO to confirm the detection inputs, protocols and APIs supported by the selected controller. Verify compatibility with each proposed detector and the required operating logic; do not assume integration with all major detection types.
2. Control Module
The control module runs the signal logic:
- Phase sequence
- Timing plans (time-of-day, traffic-responsive)
- Coordination logic
- Preemption handling
- Safety checks (conflict monitoring)
GAOQIAO controllers are the heart of the control module, with 22-56 output capacity.
3. Communication Module
Confirm which devices the communication module can connect and which protocols are supported:
- NTCIP 1202 to central system
- Fiber or copper backhaul
- 4G/5G wireless backup
- Time sync (NTP or GPS)
Confirm which communication methods the selected GAOQIAO controller supports and verify the required protocol, interface and firmware version.
4. Power Module
The power module keeps everything running:
- Mains power with UPS backup
- Solar power with battery bank
- Generator backup for critical sites
Confirm the supported power sources, transfer arrangement and protection requirements for the selected system; do not assume all sources can be combined directly.
How They Work Together
Example: A vehicle approaches the intersection
1. Detection (Module 1): Loop detects vehicle, sends pulse to controller
2. Control (Module 2): Controller decides to extend green phase
3. Communication (Module 3): Sends updated status to central system
4. Power (Module 4): All modules receive stable power
Verify the actual response time for the selected equipment and configuration.
Common Configurations
GAOQIAO supplies configurations for:
- Standalone intersections (Module 1+2+4)
- Coordinated corridors (all 4 modules)
- Adaptive systems (all 4 + central AI)
- Connected vehicle sites (Module 1 enhanced, 3 enhanced)
Conclusion
Understanding the 4 modules helps with system design. GAOQIAO supplies complete systems with all modules integrated and tested.
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Frequently Asked Questions
Can I start with 2 modules and add later?
Yes. Most intersections start with Detection + Control + Power. Communication (Module 3) is added when the system connects to a central platform.
Is radar or video detection better?
Compare radar and video detection under the site’s weather, lighting, geometry and required detection tasks. Video may provide classification and tracking data, while performance for either technology depends on the selected equipment and configuration. Ask GAOQIAO to confirm which options and interfaces are available for the project.
What is the typical cost for a 4-module system?
Request a project quotation based on the intersection layout, detection requirements, controller configuration, communication interfaces and installation scope. A complete-intersection price cannot be established from the module count alone.
Related GAOQIAO Products
These public GAOQIAO catalogue pages are related to this article.
- Traffic signal controllersWired and solar controllers with 6-56 outputs.
- LED signal heads200mm, 300mm, 400mm; confirm model-specific EN12368 evidence.
- Signal polesVertical, signal arm and double-arm configurations.
- Spare partsLED modules, lenses, visors and accessories.
Related Resources
- Traffic Signal Controller Cabinet Guide
- Traffic Light Cost & Price Guide
- LED Traffic Light Buying Guide
- LED Traffic Light Installation Guide
- Contact GAOQIAO
Related guides: projects and planning
Continue with these related resources for your traffic signal project.