Adaptive Signal Control for Right-Turn Timing
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Solution Overview
Problem
The existing traffic light automatic time adjustment system does not consider the speed of oncoming straight-traveling vehicles, which can lead to inappropriate timing for right-turning vehicles, affecting the accuracy of signal control.
Innovation Solution
A signal control system that includes sensors to detect vehicles and measure traffic flow, acquiring traffic conditions including the speed of oncoming vehicles to control the timing of signal indications for right or left turns, ensuring synchronized traffic light control for vehicles entering from different directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the timing of the right-turn signal is advanced to resolve right-turn lane congestion, then the productivity of the right-turn lane is improved, but the reliability of signal control deteriorates because the speed of oncoming vehicles is not considered
Solution Approach 1:
The system uses sensors to detect the presence and speed of oncoming vehicles, and feeds this information back to the traffic light control device. The control device then adjusts the right-turn signal timing based on this feedback, achieving adaptive signal control that maintains both productivity and reliability
Solution Approach 2:
The signal timing is made dynamic rather than fixed. The system continuously monitors oncoming vehicle conditions and adjusts the right-turn signal duration and timing accordingly, allowing the system to adapt to changing traffic conditions while maintaining safety and efficiency
2Ease of operation
If the right-turn signal timing is adjusted without considering oncoming vehicle speed, then the ease of operation is improved for right-turning vehicles, but the object-affected harmful factors increase due to potential conflicts with oncoming vehicles
Solution Approach 1:
The system detects oncoming vehicles in advance and takes preliminary action by adjusting the right-turn signal timing before a conflict can occur. By considering the speed and distance of oncoming vehicles, the system prevents potential conflicts while still allowing smooth right-turn maneuvers when safe
Data Source
AI summary
A first sensor detects a vehicle present in a lane in which a vehicle entering an intersection from a first direction is able to cross an opposite lane and turn right or left, and a vehicle entering the lane. A second sensor measures a flow of traffic of an oncoming vehicle that travels in an opposite lane from a second direction, enters the intersection, and passes through the intersection. Traffic condition acquisition means acquires a traffic condition including a speed of the oncoming vehicle based on sensor information obtained from the second sensor. Traffic light control means controls a timing of a signal indication for facilitating the right turn or the left turn in signal indications of a first traffic light and a second traffic light, based on sensor information obtained from the first sensor and the acquired traffic condition.