Traffic guidance system application solutions

The traffic guidance system is a system that utilizes electronic information technology to obtain real-time road traffic information and disseminate it to road users. It aims to improve the road traffic system by influencing the behavior of travelers, preventing traffic congestion, reducing vehicle dwell time on roads, and ultimately achieving the rational distribution of traffic flow in the road network.

The role of the traffic guidance system is mainly manifested in three aspects:

(1) In terms of traffic management, the information dissemination system broadcasts various traffic information to the traffic scene, providing timely reminders to traffic participants and reducing the likelihood of traffic congestion events.

(2) In terms of traffic organization, the collected traffic condition information allows traffic organizers to timely and comprehensively understand real-time traffic conditions, take relevant measures in advance, and maximize smooth traffic flow.

(3) In terms of traffic services, based on the obtained traffic condition information and information dissemination channels, provide traffic guidance information to traffic participants, reduce the pressure on the road network caused by blind traffic, and provide departure times and mode choices to travelers, promoting the balanced load of traffic volume throughout the entire road network.

The urban traffic guidance system includes three main components: traffic information collection, traffic information processing and generation, and traffic information dissemination. The main function of the traffic information collection system is to count, measure speed, and classify vehicle types of passing vehicles, then analyze and calculate lane occupancy information, vehicle flow rate per unit time, average vehicle speed, etc., to assess road congestion conditions. Subsequently, the collected data is sent to the management and monitoring center at predetermined time intervals through communication interfaces for traffic system’s diverse information to be reliably and accurately detected and presented to the Intelligent Transportation System (ITS), providing decision-making services for traffic scheduling and traffic event alerts.

The core of the traffic information collection system is the information detector, which targets vehicles for detection, monitors the presence or passage of vehicles, and various parameters of traffic flow on the road. Its role is to provide sufficient information to the control system for optimal control. Commonly used detectors include loop detectors, ultrasonic detectors, infrared detectors, microwave detectors, video detectors, etc.

1.Microwave Traffic Information Detector

This device is a radar detector that uses the Doppler effect to detect vehicles. It can not only detect traffic volume but also measure speed, thereby achieving the goal of detecting road traffic information. The working principle of the microwave detector is as follows: when the transmitter emits microwaves towards the ground, if a vehicle passes through the coverage area of the microwave emission line, some microwaves will be reflected and received by the receiver transducer. When the received microwave frequency is slightly higher or lower than the original emission frequency, a frequency difference (frequency deviation) occurs. By using detection circuits, the frequency difference is converted into pulse signals, allowing for the detection of vehicle presence or passage, and also speed measurement.

2.Drawbacks of Traditional Microwave Traffic Information Detectors

During installation, usage, and detection, it has been observed that traditional microwave traffic information detectors have the following shortcomings:

（1）Poor Speed Measurement Accuracy

Through multiple field tests, it has been found that in situations with low traffic flow and significant differences in vehicle speeds, the traditional microwave vehicle detectors exhibit very poor single-vehicle instantaneous speed measurement performance, with almost no accuracy. In cases of high traffic flow where vehicles have similar speeds, the accuracy of average speed measurement for all vehicles within 30 minutes is only around 90%.

（2）Probability of Data Loss Due to Large Vehicles Blocking the Detector

As the detection is done through emission and reception of microwaves, there is a high probability of data loss when large vehicles on the side lanes block the detector, leading to inaccurate traffic flow data.

（3）Difficulty in Detecting Vehicles at Low Speeds or in Congested Conditions

Vehicles driving at low speeds or in congested conditions are not easily detected by traditional microwave detectors, impacting the overall accuracy of traffic information collected.

（4）Inability to Detect Stationary Vehicles

When vehicles are stationary, they cannot be detected by radar, rendering these devices unable to provide traffic flow and speed data in situations where vehicles are queued.

（5）Detection Accuracy Affected by Surrounding Terrain

The detection accuracy of traditional microwave traffic information detectors is influenced by surrounding terrain conditions, requiring installation in flat road sections without hills or other obstacles.

These are the drawbacks identified during the installation, usage, and detection processes of traditional microwave traffic information detectors.

3.The advantages of multi-target real-time tracking visual radar:

The multi-target real-time tracking visual radar is a world-first high-performance, high-precision integrated K-band multi-target real-time tracking visual monitoring radar, completely different from traditional microwave vehicle detection. It is based on tracking and monitoring multiple targets in three-dimensional space, with forward or slant installation, detecting distances from 0 to 300 meters and speeds from 0 to 300 km/h. It can simultaneously provide high-resolution X, Y, Z three-dimensional spatial coordinates for no fewer than 32 targets, along with one-dimensional velocity radar trajectory information, and display them synchronously overlaid on the video. Its four-dimensional and visual recognition technologies enable precise speed measurement and tracking of multiple target trajectories, even when the targets are completely stationary. It can provide highly accurate data even in high traffic flow or congested road sections. Regardless of low or high traffic volume, or even congested conditions, its single-vehicle instantaneous speed testing performance is high, with extremely accurate precision. Furthermore, it is not affected by surrounding terrain conditions during installation, as it can be installed at any height and angle from 1 to 10 meters. Its unique real-time video radar trajectory information allows users to visually see and record invisible radar signals and their operational trajectories, achieving a “what you see is what you get” result, facilitating radar installation, debugging, and maintenance.