Lane Link Segmentation for Accurate Multi-Exit Speed Mapping
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Solution Overview
Problem
Conventional methods for generating links for each lane fail to accurately reflect road shapes and vehicle speeds, particularly when there are multiple exit lanes, leading to inaccuracies in speed calculation and unreliable expected arrival times.
Innovation Solution
An apparatus and method that utilize an information acquisition device to collect probe vehicle speed data and a processor to determine divided links along lanes based on speed differences and thresholds, ensuring accurate representation of road shapes and vehicle speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional link for each lane is generated from an intersection or interchange to the next intersection or IC, then the link generation process is simple and uniform, but the link does not reflect the actual road shape and vehicle queue length
Solution Approach 1:
The patent divides a conventional uniform link into multiple divided links based on probe vehicle speed differences. When vehicles exit to different lanes, the link is segmented at exit points, creating separate divided links for each lane direction. This segmentation allows each divided link to accurately represent the actual road shape and vehicle queue characteristics for that specific lane, resolving the contradiction between uniform simplicity and accurate representation.
2Reliability
If the link length is kept short and uniform, then the processing and calculation are simplified, but the link cannot properly reflect the actual vehicle queue when the queue extends beyond the link length
Solution Approach 1:
The patent implements dynamic link length adjustment by determining divided link lengths based on actual probe vehicle queue characteristics and speed differences. Instead of using fixed uniform link lengths, the system dynamically extends or contracts divided links to match the actual vehicle queue extent in each lane, ensuring reliable speed measurements while adapting to varying traffic conditions and maintaining processing efficiency through automated determination.
3Measurement precision
If average speed is calculated for a general link without considering exit lanes, then the calculation process is simple, but the speed reliability is reduced when multiple exit lanes exist
Solution Approach 1:
The patent applies local quality by calculating speeds separately for each divided link corresponding to specific lane directions rather than computing a single average speed for the entire general link. This allows speed measurements to reflect local traffic conditions in each lane (e.g., left-turn lane vs. straight-through lane), improving precision while the automated divided link generation maintains reasonable process complexity through systematic segmentation rules.
Data Source
AI summary
Disclosed are an apparatus and method for generating a link for each lane when there is a plurality of exit lanes. The apparatus may acquire information about a speed of a probe vehicle from the probe vehicle, and determine a section for generating a divided link along a lane, based on a speed difference of the probe vehicle in an exit direction. Accordingly, it is possible to improve the accuracy and reliability of the speed of each lane.