1. Challenges

Fixed-time signal control fails to adapt to real-time traffic fluctuations, causing severe mismatch between green time and actual demand — congested approaches suffer from insufficient green and queue spillback, while light-traffic approaches waste green with no vehicles passing. This "waiting vs. wasting" dilemma reduces efficiency, increases travel time, and exacerbates energy consumption and pollution — a typical cause of urban congestion. Moreover, traditional loop detectors require road excavation, incur high maintenance costs, and offer fixed placement, making them inflexible for complex intersections and unable to deliver all-weather accurate sensing.

2. Our Solution

This system uses millimeter-wave radar as the core sensing unit to detect vehicle arrival, queue length, instantaneous speed, and headway in all directions, 24/7. Through a three-tier closed-loop architecture — front-end sensing, data processing, central application — it dynamically matches green time with actual traffic demand, upgrading fixed timing to a data-driven adaptive control system.

2.1 System Components

• Front-end sensing layer: Wide-area radar detectors at intersections collect vehicle trajectories and volume; data is aggregated via a switch.

• Data processing layer: A data processor provides standard interfaces (RS485, I/O, RJ45) to interface with the signal controller for data pre-processing and protocol conversion.

• Central application layer: The signal control platform enables remote monitoring and decision-making; the RTP big data platform fuses radar and signal data for visualization, evaluation, and intelligent O&M — completing the "perception – intelligent control – data empowerment" closed loop.

2.2 How it works

The radar scans at 20 Hz, continuously detecting moving and stationary targets in each lane, outputting real-time position, speed, headway, and queue length. Front-end data is transmitted to the signal controller, which dynamically adjusts green time based on actual traffic demand: extending green during heavy flow for continuous release, and terminating green promptly during light flow to reduce waste — forming a closed-loop "sensing – analysis – control" response.

2.3 System Functions

• Virtual loop presence detection – Leveraging radar-based virtual loops flexibly placed at stop lines and critical sections, the system delivers highly reliable lane occupancy and presence duration data. Unaffected by weather, lighting, or temperature, it ensures stable detection of vehicle arrival, queuing, and departure—providing the signal controller with a robust, real‑time occupancy signal for inductive control and reducing unnecessary vehicle stops.

• Real‑time traffic data output – The system continuously outputs per‑direction vehicle arrival, queue length, and departure status, along with additional parameters such as instantaneous speed and headway. This rich, real‑time data stream enables the signal controller to make informed decisions on green extension or termination, supporting adaptive control strategies that respond instantly to changing traffic demand—minimizing wasted green and improving overall intersection throughput.

• Statistical data analytics – The platform collects and stores historical traffic volume, queue, and occupancy data, performing in‑depth analysis to generate multi‑dimensional reports, trend comparisons, and performance dashboards. These analytics support intersection performance evaluation, identify recurring congestion patterns, and provide actionable insights for signal timing optimization and long‑term traffic planning—turning raw data into strategic decision support.

3. Core Values

• All-weather precision response – Radar unaffected by light, rain, snow, or fog, ensuring 7×24 accurate detection, fundamentally eliminating wasted green and empty waiting, and improving intersection efficiency.

• Non-intrusive rapid deployment – No road excavation; pole-mounted on existing infrastructure, significantly reducing construction impact and deployment time.

• Open ecosystem compatibility – Supports I/O, RS485, RJ45, and other interfaces, adapting to mainstream signal control systems for seamless integration.

• Low life-cycle O&M cost – Long device life, minimal maintenance, easy power and network access – significantly reducing total cost of ownership.