Greek National Road 21
E394392
Greek National Road 21 is a national highway in northwestern Greece that connects the city of Arta with surrounding towns and the wider regional road network.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Greek National Road 21 canonical | 3 |
| Greek National Road 21 (Arta–Filippiada–Preveza) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3840190 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Greek National Road 21 Context triple: [Arta regional unit, hasTransport, Greek National Road 21]
-
A.
Greek National Road 30
Greek National Road 30 is a major roadway in central Greece that connects the city of Volos and nearby coastal areas with inland towns and regions.
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B.
Greek National Road 1
Greek National Road 1 is a major highway in Greece that forms part of the primary north–south route connecting Athens with Thessaloniki and other key cities.
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C.
Greek National Road 8
Greek National Road 8 is a major highway in Greece that connects Athens with the Peloponnese, serving as an important route for regional and intercity traffic.
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D.
Greek National Road 5
Greek National Road 5 is a major north–south highway in western Greece that connects the city of Ioannina with Patras, serving as an important route through Epirus and Aetolia-Acarnania.
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E.
Greek National Road 3
Greek National Road 3 is a major north–south highway in Greece that connects Athens with cities in Central and Northern Greece, serving as an important regional transport corridor.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Greek National Road 21 Target entity description: Greek National Road 21 is a national highway in northwestern Greece that connects the city of Arta with surrounding towns and the wider regional road network.
-
A.
Greek National Road 30
Greek National Road 30 is a major roadway in central Greece that connects the city of Volos and nearby coastal areas with inland towns and regions.
-
B.
Greek National Road 1
Greek National Road 1 is a major highway in Greece that forms part of the primary north–south route connecting Athens with Thessaloniki and other key cities.
-
C.
Greek National Road 8
Greek National Road 8 is a major highway in Greece that connects Athens with the Peloponnese, serving as an important route for regional and intercity traffic.
-
D.
Greek National Road 5
Greek National Road 5 is a major north–south highway in western Greece that connects the city of Ioannina with Patras, serving as an important route through Epirus and Aetolia-Acarnania.
-
E.
Greek National Road 3
Greek National Road 3 is a major north–south highway in Greece that connects Athens with cities in Central and Northern Greece, serving as an important regional transport corridor.
- F. None of above. chosen
Statements (15)
| Predicate | Object |
|---|---|
| instanceOf |
national road
ⓘ
road ⓘ |
| connects | Arta ⓘ |
| country | Greece ⓘ |
| hasFunction | regional connectivity ⓘ |
| hasRoadNumber | 21 ⓘ |
| locatedIn | northwestern Greece ⓘ |
| networkType | regional road network connector ⓘ |
| partOf | Greek national road network ⓘ |
| regionServed | Epirus ⓘ |
| roadClassification | national highway ⓘ |
| roadType | highway ⓘ |
| serves | surrounding towns of Arta ⓘ |
| terminusIncludes | Arta ⓘ |
| usedFor | road transport ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Greek National Road 21 Description of subject: Greek National Road 21 is a national highway in northwestern Greece that connects the city of Arta with surrounding towns and the wider regional road network.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Greek National Road 21