A21
E315483
A21 is a major road in the United Kingdom that connects London with the coastal town of Hastings in East Sussex.
All labels observed (1)
| Label | Occurrences |
|---|---|
| A21 canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T2986357 — 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: A21 Context triple: [A21 road, roadNumber, A21]
-
A.
A22
A22 is a major Portuguese motorway, commonly known as Via do Infante, that runs across the Algarve region in southern Portugal.
-
B.
A2100
A2100 is a widely used modular satellite bus platform developed by Lockheed Martin for commercial and military communications satellites.
-
C.
A12
The A12 is a major road in England that connects London with East Anglia, serving key towns and cities including Ipswich and Colchester.
-
D.
A20
A20 is a major Australian highway route designation used for the Sturt Highway, an important east–west transport corridor.
-
E.
A24
A24 is an independent entertainment company known for producing and distributing critically acclaimed and distinctive films and television series.
- 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: A21 Target entity description: A21 is a major road in the United Kingdom that connects London with the coastal town of Hastings in East Sussex.
-
A.
A22
A22 is a major Portuguese motorway, commonly known as Via do Infante, that runs across the Algarve region in southern Portugal.
-
B.
A2100
A2100 is a widely used modular satellite bus platform developed by Lockheed Martin for commercial and military communications satellites.
-
C.
A12
The A12 is a major road in England that connects London with East Anglia, serving key towns and cities including Ipswich and Colchester.
-
D.
A20
A20 is a major Australian highway route designation used for the Sturt Highway, an important east–west transport corridor.
-
E.
A24
A24 is an independent entertainment company known for producing and distributing critically acclaimed and distinctive films and television series.
- F. None of above. chosen
Statements (31)
| Predicate | Object |
|---|---|
| instanceOf |
road
ⓘ
trunk road ⓘ |
| connects |
Hastings
ⓘ
London ⓘ
linked to:
London, England
|
| connectsToCoastAt | Hastings ⓘ |
| country | United Kingdom ⓘ |
| hasJunctionWith |
A2100 road
ⓘ
A26 road ⓘ A28 road ⓘ M25 motorway ⓘ |
| hasSection |
dual carriageway sections
ⓘ
single carriageway sections ⓘ |
| locatedIn | England ⓘ |
| maintainedBy | National Highways ⓘ |
| partOf | British A road network ⓘ |
| passesNear |
Battle
ⓘ
Robertsbridge ⓘ Tonbridge ⓘ Tunbridge Wells ⓘ
linked to:
Tunbridge Wells borough
|
| passesThrough |
Bromley
ⓘ
East Sussex ⓘ Kent ⓘ Sevenoaks ⓘ |
| region | South East England ⓘ |
| roadType | primary route ⓘ |
| routeNumber | A21 ⓘ |
| startsNear | Lewisham ⓘ |
| terminusA |
London
ⓘ
linked to:
London, England
|
| terminusB | Hastings ⓘ |
| usedFor |
long-distance traffic between London and Hastings
ⓘ
regional traffic in Kent and East Sussex ⓘ |
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: A21 Description of subject: A21 is a major road in the United Kingdom that connects London with the coastal town of Hastings in East Sussex.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.