Road Segment Description Using ISO 17572-3 Location References
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Solution Overview
Problem
Existing traffic information systems, such as ISO 14819-1, struggle to uniquely identify road segments for traffic events on low-road-class roads, as the two delimiting locations may not be included in the location tables used by TMC messages, making it difficult to alert users effectively.
Innovation Solution
A computer-implemented method using location reference core points and extension points according to ISO 17572-3 (DLR-1) to describe road segments, where the first two points define the greater road section and the second two points further detail the segment, allowing for a comprehensive description of the road segment to be output to users, including textual or text-to-speech formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TMC codes with predefined location tables are used to identify road segments, then motorway traffic events can be easily identified by connection points, but low-road-class traffic events cannot be uniquely identified as delimiting locations are not included in the tables
Solution Approach 1:
The location reference is segmented into two hierarchical levels: location reference core points (providing basic road segment identification) and location reference extension points (providing detailed delimiting locations). This segmentation allows the system to handle both motorways and low-road-class roads effectively by combining coarse and fine-grained location information.
Solution Approach 2:
The location reference extension points are nested within the location reference core points structure. The core points provide the fundamental road segment identification while the extension points are embedded within this structure to provide additional detailed location information, creating a nested hierarchical system that works across all road classes.
2Ease of operation
If only two location reference points are provided for road segment identification, then the description is concise, but the description is not sufficient for low-road-class roads where delimiting locations are not in location tables
Solution Approach 1:
The location reference information is segmented into core points (for basic identification) and extension points (for detailed delimiting). This segmentation allows the system to maintain simplicity for motorways while providing enhanced detail for low-road-class roads, resolving the contradiction between simplicity and completeness.
Solution Approach 2:
The system provides partial location reference information (core points only) when sufficient for motorways, and excessive information (core points plus extension points) when needed for low-road-class roads. This adaptive provision of information ensures simplicity where possible while guaranteeing identifiability where needed.
Data Source
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AI summary
The present invention relates to a method for providing a description of a road segment using locations stored in a geographic database, the description of the road segment being output to a user, the road segment being identified in the geographic database on the basis of location reference points allowing a unique identification of said road segment in the geographic database based on a Dynamic Location references technique according to ISO 17572-3, the method comprising the steps of: - providing two first location reference points with which a greater road section including said road segment is described, wherein one of the two first location reference points corresponds to a first end of said greater road section and the other of the two first location reference points corresponds to a second end of said greater road section, - providing two second location reference points with which the road segment within said greater road section is described, wherein one of the two second location reference points corresponds to a first end of said road segment and the other of the two second location reference points corresponds to a second end of said road segment, the road segment being described using the first two location reference points and the second two location reference points.