Central Artery/Tunnel Project
E310522
highway project
infrastructure megaproject
transportation project
tunnel project
urban redevelopment project
The Central Artery/Tunnel Project, commonly known as the "Big Dig," was a massive Boston infrastructure megaproject that rerouted the city’s central highway into tunnels to reduce congestion and reclaim urban space.
All labels observed (8)
How this entity was disambiguated
This entity first appeared as the object of triple T2925519 — 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: Central Artery/Tunnel Project Context triple: [Ted Williams Tunnel, partOf, Central Artery/Tunnel Project]
-
A.
Center City Tunnel
Center City Tunnel is an underground rail corridor in downtown Philadelphia that links several major commuter rail lines to create a unified through-running system.
-
B.
Peninsula rail corridor
The Peninsula rail corridor is the major rail line running through California’s San Francisco Peninsula, carrying both commuter and intercity trains between San Francisco and the South Bay.
-
C.
Alameda Corridor
The Alameda Corridor is a 20-mile freight rail expressway in Los Angeles County that consolidates and streamlines cargo movement between the region’s ports and the national rail network.
-
D.
Eisenhower–Johnson Memorial Tunnel
The Eisenhower–Johnson Memorial Tunnel is a high-altitude vehicular tunnel through the Rocky Mountains in Colorado, carrying Interstate 70 beneath the Continental Divide.
-
E.
Transbay Tube
The Transbay Tube is an underwater rail tunnel beneath San Francisco Bay that carries BART trains between San Francisco and Oakland.
- 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: Central Artery/Tunnel Project Target entity description: The Central Artery/Tunnel Project, commonly known as the "Big Dig," was a massive Boston infrastructure megaproject that rerouted the city’s central highway into tunnels to reduce congestion and reclaim urban space.
-
A.
Center City Tunnel
Center City Tunnel is an underground rail corridor in downtown Philadelphia that links several major commuter rail lines to create a unified through-running system.
-
B.
Peninsula rail corridor
The Peninsula rail corridor is the major rail line running through California’s San Francisco Peninsula, carrying both commuter and intercity trains between San Francisco and the South Bay.
-
C.
Alameda Corridor
The Alameda Corridor is a 20-mile freight rail expressway in Los Angeles County that consolidates and streamlines cargo movement between the region’s ports and the national rail network.
-
D.
Eisenhower–Johnson Memorial Tunnel
The Eisenhower–Johnson Memorial Tunnel is a high-altitude vehicular tunnel through the Rocky Mountains in Colorado, carrying Interstate 70 beneath the Continental Divide.
-
E.
Transbay Tube
The Transbay Tube is an underwater rail tunnel beneath San Francisco Bay that carries BART trains between San Francisco and Oakland.
- F. None of above. chosen
Statements (58)
| Predicate | Object |
|---|---|
| instanceOf |
highway project
ⓘ
infrastructure megaproject ⓘ transportation project ⓘ tunnel project ⓘ urban redevelopment project ⓘ |
| benefit |
creation of new public open space
ⓘ
improved access to Logan International Airport ⓘ improved connections between I-90 and I-93 ⓘ shorter travel times through downtown Boston ⓘ |
| cityPartner |
Boston, Massachusetts
ⓘ
surface form:
City of Boston
|
| constructionMethod |
cut-and-cover tunneling
ⓘ
immersed tube tunneling under Boston Harbor ⓘ |
| constructionStartDate | 1991 ⓘ |
| controversy |
construction defects and leaks
ⓘ
cost overruns ⓘ political and legal disputes ⓘ safety concerns ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| createdUrbanSpace | Rose Kennedy Greenway ⓘ |
| criticizedFor |
large public debt burden
ⓘ
management and oversight problems ⓘ |
| engineeringChallenge |
construction under an active city with minimal traffic disruption
ⓘ
tunneling through soft soils and fill near Boston Harbor ⓘ |
| environmentalImpact |
improved air quality in central Boston
ⓘ
reduced surface traffic congestion in downtown Boston ⓘ |
| estimatedCostAtApproval | approximately 2.6 billion US dollars ⓘ |
| federalPartner | Federal Highway Administration ⓘ |
| finalCost | over 14 billion US dollars ⓘ |
| financingMethod |
federal highway funds
ⓘ
state funds ⓘ |
| hasAlias |
Big Dig
ⓘ
CA/T ⓘ
surface form:
CA/T Project
|
| includesHighway | Interstate 90 ⓘ |
| includesStructure |
Fort Point Channel Tunnel
ⓘ
Ted Williams Tunnel (Boston) ⓘ
surface form:
Ted Williams Tunnel
O'Neill Tunnel ⓘ
surface form:
Thomas P. O’Neill Jr. Tunnel
Zakim Bridge ⓘ
surface form:
Zakim Bunker Hill Bridge
|
| locatedIn |
Boston, Massachusetts
ⓘ
surface form:
Boston
Massachusetts ⓘ United States of America ⓘ
surface form:
United States
|
| majorOpeningDate | 2003 ⓘ |
| managingAgency |
Massachusetts Department of Transportation
ⓘ
surface form:
Massachusetts Highway Department
Massachusetts Turnpike Authority ⓘ |
| namedAfter | Central Artery ⓘ |
| notableFeature |
created new surface parks and boulevards
ⓘ
one of the most expensive highway projects in US history ⓘ placed major downtown highway traffic underground ⓘ |
| officialCompletionDate | 2007 ⓘ |
| planningStartDate | 1982 ⓘ |
| primaryHighway | Interstate 93 ⓘ |
| purpose |
reclaim urban space for parks and development
ⓘ
reduce traffic congestion in downtown Boston ⓘ reroute central highway traffic into tunnels ⓘ |
| region | New England ⓘ |
| replacedStructure | elevated Central Artery ⓘ |
| safetyIncident | 2006 tunnel ceiling collapse ⓘ |
| servesCity | Boston ⓘ |
| substantialCompletionDate | 2007 ⓘ |
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: Central Artery/Tunnel Project Description of subject: The Central Artery/Tunnel Project, commonly known as the "Big Dig," was a massive Boston infrastructure megaproject that rerouted the city’s central highway into tunnels to reduce congestion and reclaim urban space.
Referenced by (13)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Ted Williams Tunnel
this entity surface form:
Southwest Corridor project
this entity surface form:
Central Artery/Tunnel
this entity surface form:
Central Artery/Tunnel Project redevelopment area
this entity surface form:
Boston Central Artery/Tunnel Project
this entity surface form:
Big Dig project
this entity surface form:
Central Artery/Tunnel Project redevelopment
this entity surface form:
Boston’s Central Artery/Tunnel Project
this entity surface form:
Central Artery/Tunnel