A421 road
E599126
The A421 road is a major east–west route in southern England that connects key towns and links the M1 and A1 motorways, serving as an important regional transport corridor.
All labels observed (1)
| Label | Occurrences |
|---|---|
| A421 road canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T2235413 — 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: A421 road Context triple: [St Neots, hasTransportLink, A421 road]
-
A.
A4212 road
The A4212 road is a scenic route in North Wales that connects the town of Bala to Trawsfynydd through the rugged landscapes of Snowdonia.
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B.
A420 road
The A420 road is a major route in southern England linking Bristol and Oxford, passing through towns such as Chippenham and Swindon.
-
C.
A41 road
The A41 road is a major trunk route in England that runs between London and Birkenhead, serving as an important link through the Midlands and connecting with several key motorways.
-
D.
A47 road
The A47 road is a major east–west route in England that connects Birmingham to the east coast, including the town of Great Yarmouth.
-
E.
A4120 road
The A4120 road is a primary route in Ceredigion, Wales, linking the coastal town of Aberystwyth with the A44 and serving as an important connection through the Cambrian Mountains.
- 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: A421 road Target entity description: The A421 road is a major east–west route in southern England that connects key towns and links the M1 and A1 motorways, serving as an important regional transport corridor.
-
A.
A4212 road
The A4212 road is a scenic route in North Wales that connects the town of Bala to Trawsfynydd through the rugged landscapes of Snowdonia.
-
B.
A420 road
The A420 road is a major route in southern England linking Bristol and Oxford, passing through towns such as Chippenham and Swindon.
-
C.
A41 road
The A41 road is a major trunk route in England that runs between London and Birkenhead, serving as an important link through the Midlands and connecting with several key motorways.
-
D.
A47 road
The A47 road is a major east–west route in England that connects Birmingham to the east coast, including the town of Great Yarmouth.
-
E.
A4120 road
The A4120 road is a primary route in Ceredigion, Wales, linking the coastal town of Aberystwyth with the A44 and serving as an important connection through the Cambrian Mountains.
- F. None of above. chosen
Statements (41)
| Predicate | Object |
|---|---|
| instanceOf |
A road in Great Britain
ⓘ
road in England ⓘ |
| connectsTo |
A1 road
NERFINISHED
ⓘ
A4146 road NERFINISHED ⓘ A428 road NERFINISHED ⓘ A5 road NERFINISHED ⓘ A6 road NERFINISHED ⓘ M1 motorway NERFINISHED ⓘ |
| connectsTown |
Bedford
NERFINISHED
ⓘ
Bletchley NERFINISHED ⓘ Buckingham NERFINISHED ⓘ Kempston NERFINISHED ⓘ Milton Keynes NERFINISHED ⓘ St Neots NERFINISHED ⓘ |
| country | England ⓘ |
| direction | east–west ⓘ |
| function |
link between M1 and A1 motorways
ⓘ
regional transport corridor ⓘ |
| hasJunctionWith |
A1 road near St Neots
ⓘ
M1 motorway at Junction 13 NERFINISHED ⓘ |
| highwaySystem | Great Britain A roads ⓘ |
| locatedIn | southern England NERFINISHED ⓘ |
| maintainedBy |
National Highways (for trunk sections)
NERFINISHED
ⓘ
local highway authorities (for non‑trunk sections) ⓘ |
| partOf | Great Britain road network ⓘ |
| passesNear |
Bedford
NERFINISHED
ⓘ
Buckingham NERFINISHED ⓘ Kempston NERFINISHED ⓘ Milton Keynes NERFINISHED ⓘ |
| passesThrough |
Bedfordshire
NERFINISHED
ⓘ
Buckinghamshire NERFINISHED ⓘ Milton Keynes (unitary authority) NERFINISHED ⓘ |
| regionServed |
East of England
NERFINISHED
ⓘ
South East England NERFINISHED ⓘ |
| roadNumber | A421 NERFINISHED ⓘ |
| roadType |
dual carriageway (in sections)
ⓘ
primary route (in parts) ⓘ single carriageway (in sections) ⓘ |
| role |
bypass route for Bedford (via Bedford Southern Bypass)
ⓘ
strategic freight route ⓘ |
| upgradeStatus | partly upgraded to dual carriageway ⓘ |
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: A421 road Description of subject: The A421 road is a major east–west route in southern England that connects key towns and links the M1 and A1 motorways, serving as an important regional transport corridor.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.