{ "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": "dresden-tram-signal-priority", "title": "Nord-Süd-Verbindung Tram Signal Priority (QLSA)", "canonicalUrl": "https://1001smartcities.org/projects/dresden-tram-signal-priority/" }, "currentRevisionId": "2026-11-06-baseline", "revisions": [ { "id": "2026-11-06-baseline", "createdAt": "2026-11-06T06:45:54Z", "effectiveAt": "2026-11-06", "changeType": "baseline", "summary": "Created the first structured Evidence Passport with 15 claims and 5 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": "sha256:1ad991f162a1439d99e83818184045f0bfead6302b3601e3e987cdacafc8ee49", "snapshot": { "asOf": "2026-11-06", "projectFingerprint": "sha256:8f0d35a848f8abdd3373777429af1c37f09580446f305c07f8bb3e8704ef04b2", "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": 2006, "ended": null } }, "governance": { "operator": "Dresdner Verkehrsbetriebe (DVB) and City of Dresden (Straßen- und Tiefbauamt), project led by TU Dresden", "actorTypes": [ "utility", "city-government", "research" ], "fundingModel": "mixed", "fundingDescription": "EU funds provided by the Free State of Saxony, co-financed by DVB and the city's road and civil engineering office.", "cost": "€2.3 million for 24 junctions (2008–2016)", "ownership": null, "decisionRights": null, "exitConditions": null }, "claims": [ { "id": "clm-9fa79aa79688426e", "field": "snippet", "text": "Nürnberger Platz, the main station, Albertplatz and on to Klotzsche", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The news item names the section Nürnberger Platz – Hauptbahnhof – Pirnaischer Platz – Albertplatz and on to Klotzsche, one of Dresden's most important traffic axes, as the project corridor.", "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-8f9c596ebd4ed2a7", "field": "snippet", "text": "A higher-level computer links the city's VAMOS traffic management system with the operations control system of the Dresdner Verkehrsbetriebe (DVB)", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The item says the city road office's VAMOS traffic management system communicates with the DVB operations control system for this purpose.", "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-cf97aad46234bc27", "field": "snippet", "text": "calculates a tailored but shorter green phase for each tram and bus", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The item says a higher-level computer determines tailored but shorter green times for buses and trams.", "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-d53c23bb27e6c3b7", "field": "snippet", "text": "Late trams and buses get priority, early ones do not", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The item says late trams and buses are given priority at the lights, early ones are not.", "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-812ed102940883f0", "field": "snippet", "text": "the time saved goes to cars, cyclists and pedestrians", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The item says the green time saved is made available to motor traffic, cyclists and pedestrians.", "caveat": "This is the project partners' description of the design; no published measurement of the effect on other traffic was found.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-f190f7d520d0c675", "field": "snippet", "text": "A driver information system in 83 trams recommends how to pass the next lights without stopping.", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The item says the driver information system in 83 trams so far communicates with the lights and calculates recommendations so the driver passes the next signals without stopping. (The page repeats this paragraph twice with identical wording.)", "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-61c80d54fa67d2d4", "field": "snippet", "text": "Between 2008 and the end of 2016, €2.3 million converted 24 junctions", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The item says €2.3 million was used to convert 24 junctions between Nürnberger Platz and Klotzsche from 2008 to the end of 2016.", "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-5231d18171f12919", "field": "snippet", "text": "a later project added three signals on Moränenende", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-4473e1f47f3309e2" ], "supportNote": "The operator says three signals along Moränenende were fitted with the cooperative, quality-based signal control in the multimodal traffic management project.", "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-61762e423f827831", "field": "snippet", "text": "The operator says 28 per cent of tram running time is lost at lights, slow zones and through other traffic.", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-d4d11fcfbb1faaa7" ], "supportNote": "The DVB says 28 per cent of the time between first and last stop of its tram lines is lost waiting at lights, at slow zones and through obstruction by other road users.", "caveat": "The page is undated; the figure describes the tram network as a whole, not the north-south axis.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-644d771a0ca6fdd4", "field": "impact", "text": "trams on lines 3, 7 and 8 save between six and eleven per cent of travel time per direction on the axis", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "At the project's acceptance, DVB board member Lars Seiffert said lines 3, 7 and 8 now move faster on the north-south link, saving six to eleven per cent of travel time per direction.", "caveat": "An operator statement at the project's acceptance; no measurement method or before-and-after data was published with it.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-2a91b7f9935b5e04", "field": "impact", "text": "savings of up to 3 minutes per tram on the section, punctuality up 7 per cent", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-e35d5d5fcc1ad2d4" ], "supportNote": "The research database summary reports travel-time savings of up to 3 minutes per tram on the section and a 7 per cent improvement in punctuality, citing the DVB's 2015 brochure.", "caveat": "A secondary summary of an operator brochure; the brochure itself was not available to check.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-0bde545042dbc80b", "field": "impact", "text": "vehicle energy use down by up to a fifth", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-e35d5d5fcc1ad2d4" ], "supportNote": "The summary says energy consumption, measured on the vehicles, fell by up to a fifth, citing the same DVB brochure.", "caveat": "Same operator source as above; 'up to' describes a best case, not an average.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-f7964d5b46a07d8d", "field": "lesson", "text": "given only to vehicles running late", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The design gives priority only to late trams and buses, not to early ones.", "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-28448d6c5096e65a", "field": "lesson", "text": "without simply taking green time from everyone else", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The project partners say motor traffic also gains additional green time, because tram and bus green phases became shorter.", "caveat": "A statement by the project partners, not an independent measurement.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-b2b2184c32d8c153", "field": "lesson", "text": "in Dresden that link was a joint project of city, operator and university from 2006 to 2017", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b91f5e4401bf3c0b" ], "supportNote": "The item calls it a joint project of the city, DVB and TU Dresden begun in 2006, and reports its acceptance on 20 March 2017.", "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-b91f5e4401bf3c0b", "title": "TU Dresden — Schneller über die Nord-Süd-Verbindung: Innovative Ampelsteuerung jetzt komplett (21 Mar 2017)", "url": "https://tu-dresden.de/bu/verkehr/vis/vpa/die-professur/news/schneller-ueber-die-nord-sued-verbindung-innovative-ampelsteuerung-jetzt-komplett", "publisher": { "name": null, "domain": "tu-dresden.de", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-9fa79aa79688426e", "clm-8f9c596ebd4ed2a7", "clm-cf97aad46234bc27", "clm-d53c23bb27e6c3b7", "clm-812ed102940883f0", "clm-f190f7d520d0c675", "clm-61c80d54fa67d2d4", "clm-644d771a0ca6fdd4", "clm-f7964d5b46a07d8d", "clm-28448d6c5096e65a", "clm-b2b2184c32d8c153" ], "temporal": { "publishedAt": "2017-03-21", "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-11-06", "dossierCreatedAt": "2026-11-06", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "The project-leading TU chair reports completion: 24 signals on the axis Nürnberger Platz – main station – Albertplatz – Klotzsche converted between 2008 and the end of 2016 for €2.3 million; a higher-level computer links the city's VAMOS with the DVB operations control system and gives late trams and buses priority; a driver information system in 83 trams; a DVB board member says trams on lines 3, 7 and 8 save six to eleven per cent of travel time per direction.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-e35d5d5fcc1ad2d4", "title": "Forschungsinformationssystem (BMV) — Intelligente LSA-Steuerung in Dresden als Praxisbeispiel zur Beschleunigung des ÖPNV", "url": "https://www.forschungsinformationssystem.de/servlet/is/496516/?clsId0=276646&clsId1=0&clsId2=0&clsId3=0", "publisher": { "name": null, "domain": "forschungsinformationssystem.de", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-2a91b7f9935b5e04", "clm-0bde545042dbc80b" ], "temporal": { "publishedAt": "2019-03-22", "updatedAt": "2026-01-06", "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-11-06", "dossierCreatedAt": "2026-11-06", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "A synthesis entry in the federal transport research information system, written by the Wuppertal Institute and based on a DVB brochure of November 2015: tram signal influence in Dresden since 1992, the whole tram network equipped since 2004; on the north-south axis savings of up to 3 minutes per tram, punctuality up 7 per cent and vehicle energy use down by up to a fifth.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-d4d11fcfbb1faaa7", "title": "DVB — Verlässlicher Nahverkehr durch clevere Ampelschaltungen", "url": "https://www.dvb.de/de-de/die-dvb/zukunftsprojekte/verlaesslicher-nahverkehr", "publisher": { "name": null, "domain": "dvb.de", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-61762e423f827831" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-11-06", "dossierCreatedAt": "2026-11-06", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The operator says only about 70 per cent of tram running time is spent moving and at stops; 28 per cent is lost at traffic lights, slow zones and through other road users, and links its operations control system with the city's VAMOS to work on this.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-4473e1f47f3309e2", "title": "DVB — Projekt Multimodales Verkehrsmanagement der Landeshauptstadt Dresden", "url": "https://www.dvb.de/de-de/die-dvb/zukunftsprojekte/multimodales-verkehrsmanagement", "publisher": { "name": null, "domain": "dvb.de", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-5231d18171f12919" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-11-06", "dossierCreatedAt": "2026-11-06", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The operator's account of the follow-up project with the city: three signals on Moränenende fitted with the same cooperative, quality-based signal control (QLSA) and communication with the onboard driver information system; €5.3 million invested in the whole project, with federal and state funding.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-99cc454ced134e39", "title": "Dresdner Universitätsjournal — Erst kommt die Verkehrssicherheit, dann das Flüssigmachen des Verkehrs (2017)", "url": "https://tu-dresden.de/bu/verkehr/ressourcen/dateien/news/uni_journal/2017/Verkehrssicherheit_fluessiger_Verkehr_web.pdf?lang=en", "publisher": { "name": null, "domain": "tu-dresden.de", "classification": "not-classified" }, "sourceType": "pdf", "language": "und", "role": "background", "claimRefs": [], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-11-06", "dossierCreatedAt": "2026-11-06", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The university journal interview states that cooperative solutions between vehicles and infrastructure are in regular operation on the north-south link between Albertplatz and Nürnberger Platz.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } } ], "coverage": { "claimsTotal": 15, "claimsMapped": 15, "sourcesTotal": 5, "sourcesUsedByClaims": 4, "sourcesWithPublicationDate": 2, "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." ] } } ] }