Traffic Violation Detection Using Induction Loop Segmentation
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Solution Overview
Problem
Existing methods for detecting traffic violations at restricted areas, such as pedestrian crossings or intersections, are inadequate for reliably differentiating between vehicles that have entered or stopped within the restricted area and those that have actually driven through it, particularly due to limitations in using induction loops and camera triggering mechanisms.
Innovation Solution
The method involves deriving and utilizing two signals from induction loops: an entry signal when a vehicle's front enters and an exit signal when its rear exits the loop, allowing for the determination of a vehicle's occupancy within the detection area, which can differentiate between stop lane and red light violations without visual evaluation of photos.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single induction loop is used to detect vehicle presence, then the device complexity is reduced, but the measurement precision of vehicle position and violation type cannot be achieved
Solution Approach 1:
The detection area is divided into multiple segments using multiple induction loops (first induction loop 1, second induction loop 2, third induction loop 3, fourth induction loop 4) positioned at different locations. Each loop detects vehicle presence in its specific zone, enabling precise determination of whether a vehicle entered, stopped in, or drove through the restricted area during the red light phase.
2Ease of operation
If camera triggering is based solely on single point detection, then the ease of operation is improved, but the reliability of violation detection deteriorates due to inability to differentiate violation types
Solution Approach 1:
The system uses feedback from multiple induction loops to determine vehicle behavior. The evaluation unit processes signals from the induction loops to identify whether a vehicle entered the restricted area, stopped within it, or drove through it. This feedback mechanism enables differentiated violation detection (entry violation vs. through-violation) while maintaining automated camera triggering based on the evaluated violation type.
3Productivity
If fixed time interval recording is used after first detection, then the productivity is improved, but the measurement precision deteriorates because fast and slow moving vehicles cannot be reliably detected
Solution Approach 1:
The system dynamically adjusts the camera triggering strategy based on real-time vehicle detection data from multiple induction loops. Instead of using a fixed time interval, the evaluation unit continuously monitors vehicle position across different loops and triggers the camera at optimal moments to capture both the entry into and exit from the restricted area, regardless of vehicle speed. This dynamic approach ensures reliable detection of both fast-moving and slow-moving vehicles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables more accurate and differentiated detection of traffic violations, ensuring that vehicles are correctly identified as either stopping or driving through the restricted area, thereby improving the reliability of traffic enforcement and punishment.
Implementation Method 1
An induction loop is a coil with an air core. They usually consist of one to three turns with a width less than the width of the road and a depth of regularly 1 m. An induction loop has a constant inductance that increases when a metallic object, in this case a vehicle, drives into the induction loop.
Data Source
Figure 1a~1b
Figure 2a~2d
Figure 3a~3d
AI summary
The method involves generating an entrance signal (E1) when a vehicle is driven into a detection region, and generating an exit signal (A1) when the vehicle is driven out from the detection region. The passing of the vehicle to the blocked area and the inclusion of generation of other entrance and exit signals are derived from the reception of the former entrance and exit signals. It is derived that the vehicle is entered and stopped in the blocked area and generation of other entrance and exit signals are not expected during same blocked phase, when only the entrance signal is received. An independent claim is also included for a device for differentially detection of a traffic violation in a cross-road blocked area.