Fixed-time, actuated and adaptive control have different data, configuration and maintenance requirements. This guide compares those signal-control modes; the labels active and passive are not used as substitutes for their technical names.
Definitions
Fixed-Time Traffic Signal Control (Fixed-time): a preset timing plan operates without vehicle calls determining each phase duration. Plans may vary by schedule if supported; selection depends on the measured traffic pattern and project requirements.
Actuated Traffic Signal Control (Actuated): timing responds to detector calls within the configured limits. Suitability depends on detector design, traffic patterns and the approved signal plan.
Confirm the selected controller’s supported operating modes, detector interfaces and time-of-day switching in its documentation. Automatic switching between fixed-time, actuated or adaptive operation must not be assumed for every model.
When to consider fixed-time control
Consider fixed-time control after reviewing these conditions:
- Predictable traffic patterns supported by measured approach and turning-movement counts
- Coordination is the priority (urban arterials)
- Detection infrastructure cost is not justified
- Simplicity and low maintenance are priorities
Consider fixed-time control after reviewing these conditions:
- Dense urban networks where coordination and site data support the selected plan
- Small rural towns with predictable traffic
- Early-stage smart city projects
When to consider actuated control
Consider actuated control after reviewing these conditions:
- Traffic volume varies by time of day
- Left turn or side-street phases are often empty
- Detection infrastructure cost is justified by benefits
- Efficiency improvements are valuable
Consider actuated control after reviewing these conditions:
- Suburban arterials with variable demand
- Isolated intersections with sporadic peak
- Freight corridors with truck percentages
When to consider adaptive control
Adaptive control adjusts timing using traffic data. Assess its suitability, available detection and integration requirements for the following conditions:
- Traffic patterns are highly variable
- Multiple modes need to be optimized
- The corridor is critical for traffic flow
SCATS, SCOOT and InSync integration must be verified for the selected controller, firmware, interfaces and project permissions. No general compatibility claim is made; request written confirmation and an agreed integration test.
Cost Comparison
| Control mode | Cost basis | Benefit assessment |
|---|---|---|
| Fixed-time | Quoted controller, cabinet, installation and maintenance scope | Measure against the approved site baseline; no fixed improvement or payback is assumed |
| Actuated control | Also assess detection equipment, installation and upkeep | Measure against the approved site baseline; no fixed improvement or payback is assumed |
| Adaptive control | Also assess platform, integration, data and support costs | Measure against the approved site baseline; no fixed improvement or payback is assumed |
GAOQIAO can help calculate the cost-benefit for your specific intersection.
Conclusion
Compare modes using site traffic data, detector reliability, operating costs and the approved safety plan. Confirm the selected GAOQIAO model’s functions and project-specific assistance before ordering; no universal efficiency or payback result is promised.
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Frequently Asked Questions
Can a controller switch between fixed-time and actuated modes?
Confirm the selected controller’s supported operating modes, detector interfaces and time-of-day switching in its documentation. Automatic switching between fixed-time, actuated or adaptive operation must not be assumed for every model.
How should the additional cost of actuated control be assessed?
Estimate costs and benefits from measured traffic, the approved comparison baseline, equipment and installation quotations, maintenance and operating assumptions. Payback requires a project-specific calculation; traffic volume alone does not establish a return period.
How should vehicle detection be selected?
Compare inductive loops, video and radar against road works, weather, detection zones and maintenance needs. Confirm detector compatibility, available equipment and installation assistance for the selected controller and project.
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 with EN12368 certification.
- 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: controllers and wiring
Continue with these related resources for your traffic signal project.