{
 "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": "abu-dhabi-adaptive-ramp-metering",
  "title": "Adaptive Ramp Metering on Sheikh Zayed bin Sultan Street",
  "canonicalUrl": "https://1001smartcities.org/projects/abu-dhabi-adaptive-ramp-metering/"
 },
 "currentRevisionId": "2026-08-22-evidence-baseline",
 "revisions": [
  {
   "id": "2026-08-22-evidence-baseline",
   "createdAt": "2026-08-22T21:09:00Z",
   "effectiveAt": "2026-08-08",
   "changeType": "baseline",
   "summary": "Created the first structured Evidence Passport with 8 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:e4e7d1a8230148aa68de37fd0faae06c5551b0b2d44880b0bbb6f1d72401ba01",
   "snapshot": {
    "asOf": "2026-08-08",
    "projectFingerprint": "sha256:f3b743344fe95bf4d1c9dd8a7c594c234fb8ea95ae1e2141003bad48e4291f8b",
    "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": 2025,
      "ended": null
     }
    },
    "governance": {
     "operator": "Integrated Transport Centre / Abu Dhabi Mobility, Department of Municipalities and Transport",
     "actorTypes": [
      "regional-government"
     ],
     "fundingModel": "public",
     "fundingDescription": null,
     "cost": null,
     "ownership": null,
     "decisionRights": null,
     "exitConditions": null
    },
    "claims": [
     {
      "id": "clm-12edc8f4416f8a4d",
      "field": "snippet",
      "text": "Abu Dhabi's Integrated Transport Centre announced smart ramp signals at seven on-ramps feeding Sheikh Zayed bin Sultan Street",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-24c83a92b94b2be3",
       "src-40b4ccc0295bc337"
      ],
      "supportNote": "The Integrated Transport Centre (ITC), an affiliate of the Department of Municipalities and Transport, is named as the body behind the system, and both sources give the same count and the same corridor. The ITC release says the centre \"has announced the activation of a smart traffic light system (Ramp Metering) to regulate vehicle flow at seven main entry points leading to Sheikh Zayed bin Sultan Street\", and names all seven: Shakhbout bin Sultan Street, Dhafeer Street and Hadbat Al Ghubainah Street outbound, plus Salama bint Butti Street, Al Dhafra Street, Rabdan Street and the Umm Yifina Street exit inbound. Gulf News reports that the ITC \"has activated a smart traffic signal system (ramp metering) to manage vehicle flow at seven main entrances to Sheikh Zayed Bin Sultan Street\" and lists the same seven streets.",
      "caveat": "Both sources call the seven locations entry points or entrances to the street rather than on-ramps; the named list is of seven feeder streets.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-3404f2f9db895707",
      "field": "snippet",
      "text": "in August 2025",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-24c83a92b94b2be3",
       "src-40b4ccc0295bc337"
      ],
      "supportNote": "August 2025 is the month of the announcement, and the operator's own wording is about a step still to come. The ITC release is dated \"Published: Saturday, 30 August, 2025\" and states that the centre \"has announced the activation ... in the coming period\" — a future step, not a completed switch-on, and it names no activation date. Gulf News, published on 1 September 2025, reports the same announcement in the past tense (\"has activated\") but likewise gives no date. Nine months later the suppliers announced the system as newly \"successfully deployed\", which is hard to reconcile with a working network since August 2025.",
      "caveat": "No source names a date on which the signals began operating. The month given here is the month of the announcement; the operator's own release describes activation as still to come.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-c5fae2236f437db9",
      "field": "snippet",
      "text": "using radar, video and AI-flagged cameras",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-c61f6b5b1be2a9c0",
       "src-5bffe8c2f7e7dba3",
       "src-24c83a92b94b2be3"
      ],
      "supportNote": "The two halves come from different sources. The supplier release lists the detection layer as \"real-time data from multiple detection technologies - including video, radar, and in-road sensors\", and the trade report repeats it as data \"gathered from radar, video detection and embedded roadway sensors\". The camera side comes from the operator: \"The system relies on sensors and smart AI-powered cameras to monitor traffic in real time.\"",
      "caveat": "No single source lists all three together. The operator names AI-powered cameras but not radar; the suppliers name radar and video but not artificial intelligence, and they also list in-road sensors, which this entry does not mention.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-bb1d456c0311c301",
      "field": "snippet",
      "text": "to throttle merging traffic before backups form",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-24c83a92b94b2be3",
       "src-c61f6b5b1be2a9c0",
       "src-5bffe8c2f7e7dba3"
      ],
      "supportNote": "The operator describes the mechanism as automatic metering by density: the system \"automatically adjusts traffic light timings according to traffic density, reducing the number of vehicles allowed to enter during peak hours and increasing it when traffic is lighter.\" The supplier states that signal timings are adjusted \"to optimize vehicle entry, preventing bottlenecks before they form\", and the trade report that the system \"dynamically adjusts signal timings at on-ramps to smooth traffic flow before bottlenecks begin to form.\"",
      "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-1e7af41f8a1793fd",
      "field": "snippet",
      "text": "A build by Umovity, Econolite and Tatweer",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-c61f6b5b1be2a9c0",
       "src-5bffe8c2f7e7dba3"
      ],
      "supportNote": "The supplier release is issued by \"Umovity, the joint brand uniting Econolite and PTV Group - together with Tatweer\", and describes Tatweer as having \"led local engineering design, systems integration, field deployment, commissioning, and stakeholder coordination with Abu Dhabi's Integrated Transport Centre\". The trade report names the same delivery team: \"delivered by Umovity in partnership with Tatweer and supported by ST Engineering\".",
      "caveat": "Econolite is not a third party alongside Umovity but part of it — Umovity is the joint brand of Econolite and PTV Group. Both sources also name a fourth partner this entry omits, ST Engineering, whose TransSuite platform provides the central coordination. Neither operator source names any supplier.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-bbfb0d8e9eacd2da",
      "field": "snippet",
      "text": "billed as the Middle East's first fully adaptive ramp-metering system",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-c61f6b5b1be2a9c0",
       "src-5bffe8c2f7e7dba3"
      ],
      "supportNote": "The superlative is the suppliers' own, carried in the headline of their release — \"Umovity and Tatweer Launch Middle East's First Adaptive Ramp Metering System, Enabling Multi-Million-Dollar Savings\" — and in the body: the partners \"have successfully deployed the first adaptive ramp metering system in the Middle East\". The bullet list calls it \"a scalable, fully adaptive traffic management solution\". The trade report repeats the claim in its own headline and states that Abu Dhabi has deployed \"the Middle East's first adaptive ramp metering scheme\".",
      "caveat": "Both sources trace back to the suppliers' announcement, and the trade report adds no independent check. The operator's own release makes no such claim: it says only that the system makes Abu Dhabi \"one of the pioneering cities to implement this advanced system on its roads.\"",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-e50da1ca77a15a7a",
      "field": "snippet",
      "text": "links it to the emirate's traffic-modelling platform",
      "statementKind": "descriptive",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-c61f6b5b1be2a9c0",
       "src-5bffe8c2f7e7dba3"
      ],
      "supportNote": "The platform is the Intelligent Transport Central Platform (ITCP), which the operator runs. The supplier release says the solution is \"designed for interoperability with the Emirate's Intelligent Transport Central Platform (ITCP), leveraging a technology environment in which PTV Group's software solutions are already widely used for real-time traffic modeling, simulation, and network prediction.\" The trade report describes ITCP as integrating \"AI, predictive monitoring, network management and operational coordination\".",
      "caveat": "Both sources describe an intention, not a finished connection: the system is \"designed for interoperability\" with the platform, and the trade report calls it \"designed for future integration\". The modelling description comes from supplier software already used elsewhere in Abu Dhabi, not from the ramp system feeding a model.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     },
     {
      "id": "clm-2b984467227beb8c",
      "field": "snippet",
      "text": "The vendors project — but have not measured — up to $2.6M a year in avoided delay costs.",
      "statementKind": "quantitative",
      "textMode": "verbatim-from-project-record",
      "mappingStatus": "mapped",
      "sourceRefs": [
       "src-c61f6b5b1be2a9c0",
       "src-5bffe8c2f7e7dba3"
      ],
      "supportNote": "The figure is the suppliers' estimate and is labelled as such throughout. The supplier release lists \"Estimated $1.7-$2.6 million in annual congestion-cost savings\" and says the system is \"unlocking estimated savings of up to $2.6 million annually in delay-related costs\". The trade report writes that \"Estimated annual savings from reduced congestion delays are projected at approximately $2.6 million\". Neither source, nor either operator source, reports a single measured before-and-after result: the release headed \"Measurable Impact\" describes expected benefits in words only, and gives no traffic, travel-time or emissions figure.",
      "caveat": "The entry quotes only the top of the range. The suppliers state a span of $1.7 to $2.6 million a year, and neither they nor the operator say how the estimate was calculated.",
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
     }
    ],
    "sources": [
     {
      "id": "src-24c83a92b94b2be3",
      "title": "Abu Dhabi Mobility — ramp metering launch (official)",
      "url": "https://admobility.gov.ae/en/news/launched-a-ramp-metering-system-to-manage-vehicle-flow-in-abu-dhabi",
      "publisher": {
       "name": null,
       "domain": "admobility.gov.ae",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-12edc8f4416f8a4d",
       "clm-3404f2f9db895707",
       "clm-c5fae2236f437db9",
       "clm-bb1d456c0311c301"
      ],
      "temporal": {
       "publishedAt": "2025-08-30",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-08-08",
       "dossierCreatedAt": "2026-08-22",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Seven entry points, sensors/AI cameras, dynamic signal timing, platform integration.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
     {
      "id": "src-40b4ccc0295bc337",
      "title": "Gulf News — smart traffic signals with AI cameras (established press)",
      "url": "https://gulfnews.com/uae/abu-dhabi-deploys-smart-traffic-signals-with-ai-cameras-1.500252799",
      "publisher": {
       "name": null,
       "domain": "gulfnews.com",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-12edc8f4416f8a4d",
       "clm-3404f2f9db895707"
      ],
      "temporal": {
       "publishedAt": "2025-09-01",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-08-08",
       "dossierCreatedAt": "2026-08-22",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Confirms same seven locations and Sept 1, 2025 activation reporting.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
     {
      "id": "src-c61f6b5b1be2a9c0",
      "title": "Econolite — Umovity/Tatweer adaptive ramp metering (vendor, primary)",
      "url": "https://www.econolite.com/adaptive-ramp-metering-abu-dhabi/",
      "publisher": {
       "name": null,
       "domain": "econolite.com",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-c5fae2236f437db9",
       "clm-bb1d456c0311c301",
       "clm-1e7af41f8a1793fd",
       "clm-bbfb0d8e9eacd2da",
       "clm-e50da1ca77a15a7a",
       "clm-2b984467227beb8c"
      ],
      "temporal": {
       "publishedAt": "2026-05-13",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-08-08",
       "dossierCreatedAt": "2026-08-22",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Technology stack, six-month delivery, $1.7-2.6M projected annual savings (explicitly a projection, not a measured result).",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
     {
      "id": "src-5bffe8c2f7e7dba3",
      "title": "Highways Today — Abu Dhabi adaptive ramp metering (trade press)",
      "url": "https://highways.today/2026/05/14/abu-dhabi-adaptive-ramp-metering/",
      "publisher": {
       "name": null,
       "domain": "highways.today",
       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "claim-evidence",
      "claimRefs": [
       "clm-c5fae2236f437db9",
       "clm-bb1d456c0311c301",
       "clm-1e7af41f8a1793fd",
       "clm-bbfb0d8e9eacd2da",
       "clm-e50da1ca77a15a7a",
       "clm-2b984467227beb8c"
      ],
      "temporal": {
       "publishedAt": "2026-05-14",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-08-08",
       "dossierCreatedAt": "2026-08-22",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "May 2026 commissioning, vendor list, executive quotes.",
       "exact": false
      },
      "preservation": {
       "archiveUrl": null,
       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     }
    ],
    "coverage": {
     "claimsTotal": 8,
     "claimsMapped": 8,
     "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."
    ]
   }
  }
 ]
}