Permanent project revision

TfL Open Data & Unified API

Revision 2026-09-27-baseline · effective 2026-09-27

Current revision. This is the snapshot used by the live entity page.

unreviewed

Created the first structured Evidence Passport with 11 claims and 3 source dossiers.

sha256:4f60c1b97f651ec229110077f7d9d5871e685ba28065b74adea7b427e5f9e347

All revisions → Current entity page →

Change set

add /evidencePassport — Added claim-level evidence mapping and source dossiers.
add /revisionHistory — Established a permanent, hash-addressed baseline revision.

11: of 11 claims mapped
3: source dossiers
0: publication dates recorded
0: archives linked
0: exact locators
0: content captures hashed

Claims, one by one

The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.

Claim 1 clm-fcc76892569b8022 descriptive

Transport for London publishes its transport data free of charge for anyone to reuse

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: TfL's foreword to the report says it makes its data available for anyone to use, free of charge, under a version of the Open Government Licence.
Caveat: Today's use runs under TfL's own transport data terms and conditions and requires a registered API key.

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 2 clm-5b9e724a4d213086 quantitative

more than 80 data feeds at the time of the 2017 review, around 75% of them through APIs

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The report counts over 80 TfL data feeds and says around 75% of the data is available via APIs.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 3 clm-ddb6c2778371cb7c descriptive

now served through its Unified API

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: TfL's API portal and the government API catalogue both list the Unified API at api.tfl.gov.uk as the channel for TfL's open data.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Transport for London — API portal (developer registration)
UK Government API Catalogue (official)

Claim 4 clm-9a31ebe3ac1c8be2 descriptive

covering the Tube, buses, roads and cycle hire

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The report's breakdown of TfL datafeeds lists Underground, Bus, Roads and Cycle Hire data among the modes.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 5 clm-d3dc130d29de0e65 quantitative

A July 2017 Deloitte study commissioned by TfL

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The report is dated July 2017 and TfL's foreword says it asked Deloitte to undertake the review.
Caveat: TfL commissioned the study; its figures are not an independent evaluation.

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 6 clm-792312a4f7e283dd quantitative

valued the open-data policy at up to £130m a year in economic benefits and time savings

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The appendix gives an overall estimated range of £90m to £130m a year, most of it passenger time savings.
Caveat: An upper-bound estimate; the lower end of the same range is £90m a year.

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 7 clm-3066af5292e9503a quantitative

over 13,000 registered developers

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The report counts over 13,000 registered developers in 2017.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 8 clm-430bc3bdfb12f05f quantitative

more than 600 apps used by 42% of Londoners

Published field: snippet · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: TfL's foreword states over 600 apps are powered by its data, used by 42 per cent of Londoners.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 9 clm-9518e99211302148 quantitative

against a TfL cost of about £1m/year to publish the data

Published field: impact · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The report estimates TfL's cost of publishing open data at around £1m a year.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 10 clm-d9b3c404200fe4d7 quantitative

roughly 500 direct jobs plus 230 in the supply chain

Published field: impact · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The report estimates around 500 directly supported jobs and a further 230 indirect jobs.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Deloitte / TfL report (authority)

Claim 11 clm-5034d1cfe97287d7 descriptive

let a third-party developer ecosystem deliver journey tools at a fraction of the cost of doing it in-house

Published field: lesson · verbatim
Mapping: mapped · no interpretation or interpolation added by this passport
What the mapping says: The report argues that with over 13,000 registered developers the market builds the apps, saving TfL from building them itself, against a publishing cost of about £1m a year.
Caveat: No claim-specific caveat recorded

Sources carrying this claim

Deloitte / TfL report (authority)

Source dossiers and revision state

This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.

unreviewed Revision 2026-09-27-baseline effective 2026-09-27 · created 2026-09-27

Awaiting operator and domain-expert review; publication of this revision implies neither.

sha256:4f60c1b97f651ec229110077f7d9d5871e685ba28065b74adea7b427e5f9e347

Revision history → Permanent version link → Machine-readable record → Evidence Constitution →

11: of 11 claims mapped
3: source dossiers
0: publication dates recorded
0: archives linked
0: exact locators
0: content captures hashed

Governance facts carried by the record

Operator: Transport for London (TfL)
Actor types: utility
Funding model: public
Funding description: Not recorded
Cost: Not recorded
Ownership: Not recorded
Decision rights: Not recorded
Exit conditions: Not recorded

3 source dossiers

Deloitte / TfL report (authority) content.tfl.gov.uk · 10 linked claims

Open original source ↗

Stable source ID: src-c1b3d956614ccd38
Publisher: Name not classified · content.tfl.gov.uk
Type / language: pdf · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-09-27
Dossier created: 2026-09-27
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
'Assessing the value of TfL's open data and digital partnerships', July 2017 — source of the figures.
Descriptive only — not page/paragraph exact
Claims linked: clm-fcc76892569b8022
clm-5b9e724a4d213086
clm-9a31ebe3ac1c8be2
clm-d3dc130d29de0e65
clm-792312a4f7e283dd
clm-3066af5292e9503a
clm-430bc3bdfb12f05f
clm-9518e99211302148
clm-d9b3c404200fe4d7
clm-5034d1cfe97287d7

UK Government API Catalogue (official) api.gov.uk · 1 linked claim

Open original source ↗

Stable source ID: src-b624f44d15bcf25f
Publisher: Name not classified · api.gov.uk
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-09-27
Dossier created: 2026-09-27
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
Central-government API catalogue listing of TfL's Unified API, its endpoint and documentation.
Descriptive only — not page/paragraph exact
Claims linked: clm-ddb6c2778371cb7c

Transport for London — API portal (developer registration) api-portal.tfl.gov.uk · 1 linked claim

Open original source ↗

Stable source ID: src-88b061df925431ca
Publisher: Name not classified · api-portal.tfl.gov.uk
Type / language: web-page · language not classified
Published: Not recorded
Updated: Not recorded
Source last checked: No source-level check date
Record last verified: 2026-09-27
Dossier created: 2026-09-27
Retrieved copy: No local capture recorded
Archive: No archived copy linked
Content hash: No captured content hash
Locator: Open the recorded source note
TfL's developer portal: register for an account, subscribe to the 500-requests data plan and use an app_key; data is released for reuse under TfL's transport data terms and conditions.
Descriptive only — not page/paragraph exact
Claims linked: clm-ddb6c2778371cb7c

Known limits of this passport

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.