Caldecott Tunnel
E456739
The Caldecott Tunnel is a major highway tunnel in the San Francisco Bay Area that carries traffic through the Berkeley Hills between Oakland and Contra Costa County.
All labels observed (6)
| Label | Occurrences |
|---|---|
| Caldecott Tunnel canonical | 6 |
| Caldecott Tunnel corridor | 1 |
| Caldecott Tunnel first bore | 1 |
| Caldecott Tunnel fourth bore | 1 |
| Caldecott Tunnel second bore | 1 |
| Caldecott Tunnel third bore | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4638161 — 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: Caldecott Tunnel Context triple: [Berkeley Hills, crossedBy, Caldecott Tunnel]
-
A.
Hindhead Tunnel
Hindhead Tunnel is a major road tunnel in Surrey, England, carrying the A3 beneath the Devil’s Punch Bowl to improve traffic flow and reduce environmental impact on the surrounding countryside.
-
B.
Dartford Tunnel
The Dartford Tunnel is a major road tunnel under the River Thames in southeast England, forming part of a key river crossing on the London orbital route.
-
C.
Reigate Tunnel
Reigate Tunnel is a historic road tunnel in Reigate, Surrey, notable as one of the earliest road tunnels in Britain and now a distinctive local landmark.
-
D.
Malpas Tunnel
Malpas Tunnel is a historic canal tunnel in southern France, notable as one of the first navigable tunnels built for the Canal du Midi in the 17th century.
-
E.
Blisworth Tunnel
Blisworth Tunnel is one of the longest navigable canal tunnels in Britain, carrying the Grand Union Canal beneath the Northamptonshire countryside.
- 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: Caldecott Tunnel Target entity description: The Caldecott Tunnel is a major highway tunnel in the San Francisco Bay Area that carries traffic through the Berkeley Hills between Oakland and Contra Costa County.
-
A.
Hindhead Tunnel
Hindhead Tunnel is a major road tunnel in Surrey, England, carrying the A3 beneath the Devil’s Punch Bowl to improve traffic flow and reduce environmental impact on the surrounding countryside.
-
B.
Dartford Tunnel
The Dartford Tunnel is a major road tunnel under the River Thames in southeast England, forming part of a key river crossing on the London orbital route.
-
C.
Reigate Tunnel
Reigate Tunnel is a historic road tunnel in Reigate, Surrey, notable as one of the earliest road tunnels in Britain and now a distinctive local landmark.
-
D.
Malpas Tunnel
Malpas Tunnel is a historic canal tunnel in southern France, notable as one of the first navigable tunnels built for the Canal du Midi in the 17th century.
-
E.
Blisworth Tunnel
Blisworth Tunnel is one of the longest navigable canal tunnels in Britain, carrying the Grand Union Canal beneath the Northamptonshire countryside.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
highway tunnel
ⓘ
road tunnel ⓘ |
| carries | California State Route 24 ⓘ |
| connects |
Contra Costa County, California
ⓘ
linked to:
Contra Costa County
Oakland, California ⓘ
linked to:
Oakland
|
| constructionType | bored tunnel ⓘ |
| country | United States of America ⓘ |
| crosses | Berkeley Hills geologic formation ⓘ |
| hasBore |
Caldecott Tunnel first bore
ⓘ
linked to:
Caldecott Tunnel
Caldecott Tunnel fourth bore ⓘ
linked to:
Caldecott Tunnel
Caldecott Tunnel second bore ⓘ
linked to:
Caldecott Tunnel
Caldecott Tunnel third bore ⓘ
linked to:
Caldecott Tunnel
|
| hasDirection |
eastbound
ⓘ
westbound ⓘ |
| hasEvent | 1982 Caldecott Tunnel fire ⓘ |
| hasLanes | multiple traffic lanes in each direction ⓘ |
| hasLighting | interior tunnel lighting ⓘ |
| hasSpeedLimit | typical freeway speed limit ⓘ |
| hasToll | no ⓘ |
| isMajorRouteFor | commuters between Oakland and Contra Costa County ⓘ |
| isPartOfNetwork |
California State Highway System
ⓘ
linked to:
California state highway system
|
| length |
approximately 1.1 miles
ⓘ
approximately 1.7 kilometers ⓘ |
| locatedIn |
Berkeley Hills
ⓘ
Contra Costa County, California ⓘ
linked to:
Contra Costa County
Oakland, California ⓘ
linked to:
Oakland
San Francisco Bay Area ⓘ |
| locatedNear |
Berkeley, California
ⓘ
linked to:
Berkeley, California, United States
Orinda, California ⓘ |
| maintainedBy |
California Department of Transportation
ⓘ
linked to:
Caltrans
|
| namedAfter | Thomas E. Caldecott ⓘ |
| notUsedFor |
pedestrian traffic
ⓘ
rail traffic ⓘ |
| numberOfBores | 4 ⓘ |
| opened |
1937
ⓘ
1964 ⓘ 2013 ⓘ |
| operator |
California Department of Transportation
ⓘ
linked to:
Caltrans
|
| originalName | Broadway Low Level Tunnel ⓘ |
| partOf | California State Route 24 corridor ⓘ |
| passesThrough | Berkeley Hills ⓘ |
| regionServed |
East Bay
ⓘ
San Francisco Bay Area commuter traffic ⓘ |
| roadType | freeway ⓘ |
| safetyFeature |
emergency exits
ⓘ
fire suppression systems ⓘ ventilation system ⓘ |
| usedFor | vehicular traffic ⓘ |
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: Caldecott Tunnel Description of subject: The Caldecott Tunnel is a major highway tunnel in the San Francisco Bay Area that carries traffic through the Berkeley Hills between Oakland and Contra Costa County.
Referenced by (11)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Caldecott Tunnel
linked to: Caldecott Tunnel
linked to: Caldecott Tunnel
linked to: Caldecott Tunnel
linked to: Caldecott Tunnel