Vehicle-Server Traffic Light Timing Prediction
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Solution Overview
Problem
Conventional traffic light information systems require costly roadside devices to provide accurate movement assistance, and existing systems that use social networking services for traffic light information rely on user-posted images, leading to uncertainties in traffic light color change timing.
Innovation Solution
A vehicle-server communication system that transmits vehicle data, including time and position information, to estimate and predict the timing of traffic light color changes without introducing new devices, using existing vehicle-mounted sensors and GPS for accurate and cost-effective traffic light information provision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If roadside devices are provided at each intersection to transmit traffic light information, then traffic light information can be provided to vehicles, but system construction cost becomes high
Solution Approach 1:
The vehicle itself serves as the detection device by using its own sensors (acceleration sensor, GPS receiver) to detect traffic light color changes and calculate remaining green light time, eliminating the need for external roadside devices at each intersection
Solution Approach 2:
The vehicle's existing navigation system and sensors are made multi-functional by adding the capability to detect traffic light color changes and calculate timing, so the same device serves both navigation and traffic light information provision functions
2Device complexity
If social networking service posts are used to obtain traffic light information, then roadside devices are not necessary, but accuracy depends on user posting timeliness
Solution Approach 1:
The manual image-posting mechanism of SNS is replaced with an automated sensor-based detection system that objectively detects traffic light color changes through the vehicle's acceleration sensor and GPS, eliminating human reaction time delays
Solution Approach 2:
The system continuously monitors vehicle acceleration and position data to detect the moment of traffic light color change, providing real-time feedback on remaining green light time to the driver through the navigation system
3Measurement precision
If vehicle data is transmitted when vehicle speed exceeds threshold from stop state, then traffic light change timing can be specified, but time lag may occur between light change and vehicle response
Solution Approach 1:
The system calculates and displays the remaining green light time to the driver in advance before the light actually changes, allowing the driver to take preliminary action (maintain or adjust speed) to pass through the intersection during the green phase without abrupt acceleration or braking
Data Source
AI summary
A traffic light information providing system includes a vehicle and a server configured to communicate with the vehicle, and provides information on change in color of a traffic light to the vehicle. The vehicle transmits to the server, vehicle data including time information and position information of the vehicle at the time when the vehicle resumes running from a state of stop at an intersection. The server operates and stores a period of change from the red light to the green light of a traffic light provided at the intersection based on the vehicle data. The server transmits information indicating timing of change to the green light of the traffic light based on the stored period of change, to a vehicle which approaches the intersection.