R21
E914648
R21 is a major South African freeway that forms part of the national route network, connecting Pretoria with OR Tambo International Airport and the East Rand.
All labels observed (1)
| Label | Occurrences |
|---|---|
| R21 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11257703 — 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: R21 Context triple: [R21 freeway, abbreviation, R21]
-
A.
R21
R21 is a regional commuter rail line in Catalonia, Spain, operated as part of the Rodalies de Catalunya network.
-
B.
R211
The R211 is a modern class of New York City Subway cars designed to replace older rolling stock and improve reliability, capacity, and passenger amenities on lines including the BMT Canarsie Line.
-
C.
R2
R2 is the MBTA station code used to identify Ashmont station on Boston's Red Line transit system.
-
D.
R20
R20 is a regional commuter rail line in Catalonia that forms part of the Rodalies de Catalunya network.
-
E.
R-14
R-14 was a Soviet intermediate-range ballistic missile developed during the Cold War and known in the West by its NATO reporting name SS-5 Skean.
- 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: R21 Target entity description: R21 is a major South African freeway that forms part of the national route network, connecting Pretoria with OR Tambo International Airport and the East Rand.
-
A.
R21
R21 is a regional commuter rail line in Catalonia, Spain, operated as part of the Rodalies de Catalunya network.
-
B.
R211
The R211 is a modern class of New York City Subway cars designed to replace older rolling stock and improve reliability, capacity, and passenger amenities on lines including the BMT Canarsie Line.
-
C.
R2
R2 is the MBTA station code used to identify Ashmont station on Boston's Red Line transit system.
-
D.
R20
R20 is a regional commuter rail line in Catalonia that forms part of the Rodalies de Catalunya network.
-
E.
R-14
R-14 was a Soviet intermediate-range ballistic missile developed during the Cold War and known in the West by its NATO reporting name SS-5 Skean.
- F. None of above. chosen
Statements (34)
| Predicate | Object |
|---|---|
| instanceOf |
freeway
ⓘ
national route ⓘ |
| abbreviation | R21 ⓘ |
| access | limited-access highway ⓘ |
| category |
National roads in South Africa
ⓘ
Roads in Gauteng ⓘ |
| connects |
East Rand
ⓘ
OR Tambo International Airport ⓘ
linked to:
O. R. Tambo International Airport
Pretoria ⓘ
linked to:
Pretoria, South Africa
|
| country | South Africa ⓘ |
| function |
links Pretoria to East Rand
ⓘ
links Pretoria to OR Tambo International Airport ⓘ |
| hasJunctionWith |
M31 (Gauteng)
ⓘ
N1 ⓘ N12 ⓘ R23 ⓘ R24 ⓘ R25 ⓘ |
| laneConfiguration | multi-lane in each direction ⓘ |
| locatedIn |
Gauteng Province
ⓘ
linked to:
Gauteng
Highveld region of South Africa ⓘ
linked to:
Highveld
|
| maintainedBy | South African National Roads Agency Limited ⓘ |
| partOf |
South African national route network
ⓘ
linked to:
South African National Route network
|
| passesNear |
Centurion
ⓘ
Kempton Park ⓘ |
| region | Gauteng ⓘ |
| roadNumberingSystem | South African regional route system ⓘ |
| roadType |
dual carriageway
ⓘ
freeway-standard road ⓘ |
| serves |
City of Tshwane
ⓘ
linked to:
City of Tshwane Metropolitan Municipality
Ekurhuleni ⓘ |
| terminus |
OR Tambo International Airport vicinity
ⓘ
Pretoria ⓘ
linked to:
Pretoria, South Africa
|
| tollStatus | partially tolled ⓘ |
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: R21 Description of subject: R21 is a major South African freeway that forms part of the national route network, connecting Pretoria with OR Tambo International Airport and the East Rand.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject linked to:
R21 freeway (nearby access)