{
 "schemaVersion": "1.0.0",
 "constitutionVersion": "1.0.0",
 "createdAt": "2026-08-12T00:00:00Z",
 "description": "Append-only Evidence Passport records. Old revisions are immutable; corrections create a new revision and preserve the previous permalink.",
 "entity": {
  "type": "project",
  "id": "bangkok-smart-traffic",
  "title": "BMA AI Adaptive Traffic Signals",
  "canonicalUrl": "https://1001smartcities.org/projects/bangkok-smart-traffic/"
 },
 "currentRevisionId": "2026-08-21-reverification",
 "revisions": [
  {
   "id": "2026-08-21-reverification",
   "createdAt": "2026-08-21T21:10:00Z",
   "effectiveAt": "2026-08-21",
   "changeType": "baseline",
   "summary": "Created the first structured Evidence Passport with 12 claims and 4 source dossiers.",
   "preparedBy": {
    "type": "automation",
    "label": "AI-assisted evidence preparation",
    "humanApproved": false
   },
   "review": {
    "status": "unreviewed",
    "by": null,
    "date": null,
    "note": "Awaiting operator and domain-expert review; publication of this revision implies neither."
   },
   "changes": [
    {
     "operation": "add",
     "path": "/evidencePassport",
     "summary": "Added claim-level evidence mapping and source dossiers."
    },
    {
     "operation": "add",
     "path": "/revisionHistory",
     "summary": "Established a permanent, hash-addressed baseline revision."
    }
   ],
   "snapshotHash": "sha256:894481cbcc74c50ed335a9c8aa39eb5db124ac41b3397cb515549e6ebc8d7b2a",
   "snapshot": {
    "asOf": "2026-08-21",
    "projectFingerprint": "sha256:2cb93f0573a2398014cae58cf2341f995042537747d08e2c1fc4b1c7e015bf7f",
    "assurance": {
     "status": "unreviewed",
     "scope": "evidence-passport-revision",
     "statement": "AI-assisted structural preparation. This revision has not been reviewed by a human or subject-matter expert.",
     "machineChecks": [
      "schema",
      "publication-diff-contract",
      "material-project-fingerprint",
      "claim-text-drift",
      "source-reference-resolution",
      "complete-source-dossier",
      "snapshot-hash"
     ]
    },
    "projectState": {
     "status": "live",
     "outcome": "ongoing",
     "evidenceGrade": "official",
     "timeline": {
      "started": 2024,
      "ended": null
     }
    },
    "governance": {
     "operator": "Bangkok Metropolitan Administration (BMA)",
     "actorTypes": [
      "city-government"
     ],
     "fundingModel": "public",
     "fundingDescription": null,
     "cost": null,
     "ownership": null,
     "decisionRights": null,
     "exitConditions": null
    },
    "claims": [
     {
      "id": "clm-657b8d141411bdc3",
      "field": "snippet",
      "text": "cameras read real-time vehicle volumes and adjust green time",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-715d538e16bd9794",
       "src-4ac06a3b6b87f739"
      ],
      "supportNote": "The Nation states the mechanism plainly, and the BMA release names the system as Adaptive Control fed by AI CCTV.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-3caf98aea6eceba5",
      "field": "snippet",
      "text": "It reached 74 junctions on main corridors during 2024–2025",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-4ac06a3b6b87f739",
       "src-d9fbc0339769259d"
      ],
      "supportNote": "The BMA states installation and activation at 74 junctions during Thai years 2567–2568 (2024–2025); PPTV independently lists 74 junctions on the new adaptive real-time CCTV system. The corridors named by the BMA include Sukhumvit, Rama IV, Phahon Yothin, Sathorn and Silom.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-6d008942a74b2f0e",
      "field": "snippet",
      "text": "out of 746 junctions the BMA manages",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-4ac06a3b6b87f739",
       "src-d9fbc0339769259d"
      ],
      "supportNote": "Both give 746 as the total number of junctions under BMA responsibility; PPTV splits it into 168 unsignalised and 578 signalised.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-d67b4f9d3f48464f",
      "field": "snippet",
      "text": "433 still run fixed timings",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-d9fbc0339769259d"
      ],
      "supportNote": "PPTV's junction-type breakdown lists 433 junctions on the fixed-time system, against 71 on the adaptive loop-detector system and 74 on the new camera-fed system; the three sum to the stated 578 signalised junctions.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-4fdcf194d25bdc2f",
      "field": "snippet",
      "text": "50 more upgrades were planned for 2026",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-4ac06a3b6b87f739",
       "src-d9fbc0339769259d"
      ],
      "supportNote": "The BMA headline states 74 installed and 50 more being prepared; PPTV separately reports the plan to add 50 junctions during Thai year 2569 (2026). A further 20 mentioned for later are deliberately not claimed here.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-98762bac2c29ae70",
      "field": "impact",
      "text": "The BMA reports that delay at upgraded junctions fell by 10–41% on average",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-4ac06a3b6b87f739",
       "src-715d538e16bd9794"
      ],
      "supportNote": "The BMA release states an average delay reduction of 10–41% at junction areas; the Nation reported the same range a year earlier at the 72-junction state. The range originates with the city, not with the press.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-bd25c26a10830a48",
      "field": "impact",
      "text": "with the largest cut, 41%, at the Sam Liam Din Daeng junction",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-4ac06a3b6b87f739",
       "src-dcad266a6fe4f924"
      ],
      "supportNote": "Both carry the same sentence naming the Din Daeng triangle junction as the clearest example, with a maximum delay reduction of 41%. This corrects the earlier record, which attached the 41% to Phra Khanong.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-ee3729b6a2d18f66",
      "field": "impact",
      "text": "at Phra Khanong on the Rama IV side it says red-light waiting fell from 12 minutes to 5–6",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-4ac06a3b6b87f739",
       "src-dcad266a6fe4f924"
      ],
      "supportNote": "The BMA sentence specifies the Rama IV approach of Phra Khanong junction, describes the 12 minutes as what residents had complained of waiting at a red light, and gives 5–6 minutes now. It is a waiting time at one approach — not a signal cycle, and not a figure for the junction as a whole.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-4ff2551be24c4c21",
      "field": "impact",
      "text": "no independent evaluation has been published",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-4ac06a3b6b87f739"
      ],
      "supportNote": "A negative finding, so no passage can carry it: searches in Thai and English for an audit, academic study or third-party traffic index covering the BMA adaptive signals returned nothing; every figure in circulation traces back to the BMA release.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-9b353bdabb00e7ae",
      "field": "lesson",
      "text": "433 of Bangkok's 578 signalised crossings still run fixed timings",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-d9fbc0339769259d"
      ],
      "supportNote": "PPTV states 578 of the 746 junctions have signals and breaks them down as 433 fixed-time, 71 adaptive loop-detector, 74 adaptive real-time CCTV.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-1ee650613eadc021",
      "field": "lesson",
      "text": "another 71 sit on an older loop-detector system",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-d9fbc0339769259d"
      ],
      "supportNote": "PPTV's breakdown lists a separate, pre-existing adaptive system on inductive loop detectors at 71 junctions, distinct from the 74 camera-fed junctions this entry describes. The English product name appears verbatim in the Thai text.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-5ab665fa24d1fe17",
      "field": "lesson",
      "text": "everything known about what the retiming buys comes from the city's own assessment",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-4ac06a3b6b87f739"
      ],
      "supportNote": "An editorial characterisation of the source position rather than a quotable sentence: the 10–41% range, the Din Daeng 41% and the Phra Khanong waiting time all originate in this BMA release and are repeated unchanged by every outlet found.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     }
    ],
    "sources": [
     {
      "id": "src-4ac06a3b6b87f739",
      "title": "Bangkok Metropolitan Administration — Adaptive signals at 74 junctions, 50 more planned (operator)",
      "url": "https://pr-bangkok.com/?p=581620",
      "publisher": {
       "name": null,
       "domain": "pr-bangkok.com",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-657b8d141411bdc3",
       "clm-3caf98aea6eceba5",
       "clm-6d008942a74b2f0e",
       "clm-4fdcf194d25bdc2f",
       "clm-98762bac2c29ae70",
       "clm-bd25c26a10830a48",
       "clm-ee3729b6a2d18f66",
       "clm-4ff2551be24c4c21",
       "clm-5ab665fa24d1fe17"
      ],
      "temporal": {
       "publishedAt": "2026-03-02",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-08-21",
       "dossierCreatedAt": "2026-08-21",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Load-bearing primary: 746 junctions under BMA care, 74 installed during 2024–2025, average 10–41% delay reduction, the 41% maximum at Sam Liam Din Daeng, the Phra Khanong (Rama IV side) red-light wait of 12 minutes down to 5–6, and the +50 junctions planned for 2026. Every performance figure on this page is the city's own.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
     {
      "id": "src-d9fbc0339769259d",
      "title": "PPTV HD36 — how Bangkok's 746 junctions are signalled (press)",
      "url": "https://www.pptvhd36.com/news/269280",
      "publisher": {
       "name": null,
       "domain": "pptvhd36.com",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-3caf98aea6eceba5",
       "clm-6d008942a74b2f0e",
       "clm-d67b4f9d3f48464f",
       "clm-4fdcf194d25bdc2f",
       "clm-9b353bdabb00e7ae",
       "clm-1ee650613eadc021"
      ],
      "temporal": {
       "publishedAt": "2026-02-23",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-08-21",
       "dossierCreatedAt": "2026-08-21",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "The coverage breakdown the operator release omits: 746 junctions under BMA, 168 unsignalised, 578 signalised — 433 fixed-time, 71 adaptive loop-detector, 74 adaptive real-time CCTV. Also repeats the 10–41% figure and the 50-junction expansion for 2026.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
     {
      "id": "src-dcad266a6fe4f924",
      "title": "Thai PBS The Active — Adaptive Control signals adjust to traffic volume (press)",
      "url": "https://theactive.thaipbs.or.th/news/urban-20260303",
      "publisher": {
       "name": null,
       "domain": "theactive.thaipbs.or.th",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-bd25c26a10830a48",
       "clm-ee3729b6a2d18f66"
      ],
      "temporal": {
       "publishedAt": "2026-03-03",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-08-21",
       "dossierCreatedAt": "2026-08-21",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Public-broadcaster coverage; second source for the two junction-level results (Din Daeng 41%, Phra Khanong 12 to 5–6 minutes) and notes that most of the estate still runs fixed timings.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
     {
      "id": "src-715d538e16bd9794",
      "title": "Nation Thailand — smart traffic signals reduce congestion by up to 41% (press)",
      "url": "https://www.nationthailand.com/thailand/bangkok/40051153",
      "publisher": {
       "name": null,
       "domain": "nationthailand.com",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-657b8d141411bdc3",
       "clm-98762bac2c29ae70"
      ],
      "temporal": {
       "publishedAt": "2025-06-12",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-08-21",
       "dossierCreatedAt": "2026-08-21",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "The earlier state of the rollout: 72 intersections since March 2025, delays down an average 10–41%, and a then-stated ambition of 200 more junctions that has not been repeated since. Describes the mechanism — timings adjust to actual traffic volume.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     }
    ],
    "coverage": {
     "claimsTotal": 12,
     "claimsMapped": 12,
     "sourcesTotal": 4,
     "sourcesUsedByClaims": 4,
     "sourcesWithPublicationDate": 4,
     "sourcesWithArchive": 0,
     "sourcesWithExactLocator": 0,
     "sourcesWithContentHash": 0
    },
    "limits": [
     "Publisher names and source languages have not yet been classified; domains are recorded without guessing.",
     "Existing source notes are descriptive locators, not page- or paragraph-exact citations.",
     "A missing archive, publication date or content hash is shown as null rather than inferred.",
     "The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim."
    ]
   }
  }
 ]
}