1001 Smart Cities

Permanent project revision

Belgrade Sitraffic Adaptive Traffic Control

Revision 2026-08-21-evidence-baseline · effective 2026-07-19

Superseded. A later revision exists: 2026-08-21-unsourced-text-correction →

unreviewed

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

sha256:e9c77e13d7360ba95af50c41bebaba63929bdfb6223dab7070a589d73906a174
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
2
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-44a51e72719bcd42 quantitative
Since 2019 Belgrade has been retrofitting its junctions
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Balkan Green Energy News is dated 30 September 2019 and reports the agreement signed that day to introduce the adaptive traffic control system in Belgrade. Kurir confirms the starting point retrospectively in 2022: the city “krajem 2019. godine potpisao ugovor za implementaciju sistema adaptibilnog upravljanja saobraćajem” (signed a contract at the end of 2019 to implement an adaptive traffic management system).
Caveat
Both sources date the contract, not the first junction actually retrofitted; neither says when work began on site.

Sources carrying this claim

  1. Balkan Green Energy News — Siemens Belgrade deal
  2. Kurir — 280 smart-signal intersections
Claim 2 clm-ef66081fd8bf4a23 descriptive
with Siemens Mobility's Sitraffic Scala adaptive control
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The Yunex Traffic country page names the product: continuous system operation monitoring and management for mobility operators is enabled through “Sitraffic Scala”, described as an “adaptive traffic control system for the city road network”. Balkan Green Energy News names Siemens Mobility as a signing party to the 2019 agreement.
Caveat
Neither source states product and vendor together: the Yunex page names Sitraffic Scala but not Siemens Mobility, while the 2019 article names Siemens Mobility but never uses the product name.

Sources carrying this claim

  1. Yunex Traffic — Serbia (operator)
  2. Balkan Green Energy News — Siemens Belgrade deal
Claim 3 clm-f488f51d67250151 descriptive
retimes signals in real time from live traffic data
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The operator page describes an “adaptive traffic control system for the city road network” driven by “Real-time traffic data”, improving parameters including “shortened travel times, minimized number of stops, reduced exhaust emissions and urban noise pollution”.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Yunex Traffic — Serbia (operator)
Claim 4 clm-ba32ab0cf0888c20 descriptive
gives trams priority
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Yunex states that “innovative technologies, including tram prioritization, are being implemented on over 300 intersections in Belgrade”. Balkan Green Energy News describes the mechanism: “The system will give trams the right of way as soon as they approach intersections.”
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Yunex Traffic — Serbia (operator)
  2. Balkan Green Energy News — Siemens Belgrade deal
Claim 5 clm-744fc7e5725c13c0 quantitative
280 of the city's roughly 650 signalised intersections were connected by late 2022
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Kurir, published 25 October 2022, carries the count in its headline: “U Beogradu već 280 raskrsnica sa pametnim semaforima” (Belgrade already has 280 intersections with smart traffic lights). The denominator comes from Balkan Green Energy News: “Belgrade currently has a total of 650 signalized intersections.”
Caveat
Kurir gives 280 as of 25 October 2022; Yunex's undated page says 'over 300'. The entry now states the sourced figure rather than 'more than 280'.

Sources carrying this claim

  1. Kurir — 280 smart-signal intersections
  2. Balkan Green Energy News — Siemens Belgrade deal
Claim 6 clm-a6ad140c2698e8ad descriptive
with the rollout continuing under Yunex Traffic
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The page is Yunex Traffic's own Serbia country page and describes the Belgrade deployment in the progressive: technologies including tram prioritisation “are being implemented on over 300 intersections in Belgrade”, so the work is presented as ongoing and delivered by Yunex Traffic, the Siemens Mobility spin-off.
Caveat
The page is undated, so it shows that Yunex Traffic presents the rollout as ongoing but fixes no point in time; it also does not describe the handover from Siemens Mobility to Yunex Traffic.

Sources carrying this claim

  1. Yunex Traffic — Serbia (operator)
Claim 7 clm-1250e621d5b50744 quantitative
City analysis reported morning travel time on Bulevar kralja Aleksandra cut about 26%
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Kurir reports: “vreme putovanja i broj zaustavljanja u jutarnjem špicu u Bulevaru kralja Aleksandra, u smeru od Cvetkove pijace ka Tašmajdanskom parku smanjeno za čak 26 procenata” – travel time and the number of stops in the morning peak on Bulevar kralja Aleksandra, in the direction from Cvetkova pijaca towards Tašmajdan park, reduced by as much as 26 per cent.
Caveat
The 26 per cent covers travel time and the number of stops together, not travel time alone, and applies to one direction of one boulevard in the morning peak. It is the city's own analysis relayed by a newspaper, with no independent measurement and no stated baseline.

Sources carrying this claim

  1. Kurir — 280 smart-signal intersections
Claim 8 clm-c66949cc15c9ed26 quantitative
tram journey times on prioritised routes shortened by up to 40%
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Kurir reports: “U Ruzveltovoj ulici tramvajima je vreme putovanja skraćeno i do 40 odsto u proseku” – in Ruzveltova street tram journey time was shortened by up to 40 per cent on average.
Caveat
The source names a single street, Ruzveltova, not “prioritised routes” in the plural, and pairs “up to” with “on average” without saying over what period or against what baseline. Again a city figure relayed by the newspaper, not an independent measurement.

Sources carrying this claim

  1. Kurir — 280 smart-signal intersections
Claim 9 clm-19e631368d2f316d quantitative
The 322-junction rollout
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Balkan Green Energy News states the scope of phase 1: “The three-year project is to secure the adaptive traffic control system at 322 signalized intersections in Belgrade by 2021.” Kurir repeats the same figure in 2022: the contract of late 2019 covered “322 raskrsnice”.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Balkan Green Energy News — Siemens Belgrade deal
  2. Kurir — 280 smart-signal intersections
Claim 10 clm-7d133b95f88e6146 quantitative
first promised for 2021
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The 2019 article gives the target date and attributes it: “The three-year project is to secure the adaptive traffic control system at 322 signalized intersections in Belgrade by 2021, said Vesić.”
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Balkan Green Energy News — Siemens Belgrade deal
Claim 11 clm-d71a852700271db4 descriptive
slipped by several years
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Kurir shows the target missed: on 25 October 2022, nearly a year past the 2021 deadline, 280 of the contracted 322 intersections were connected. The undated Yunex Traffic page still describes the technologies as “being implemented”, so the rollout had not closed out at the time of writing.
Caveat
No source states a delay, let alone one of several years. The slippage is an inference from two datapoints – the 2021 target in the 2019 agreement, and 280 of 322 connected in late 2022 with work continuing – and roughly one year lies between them, so “several years” is carried by neither source.

Sources carrying this claim

  1. Kurir — 280 smart-signal intersections
  2. Yunex Traffic — Serbia (operator)

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 2026-08-21-evidence-baseline effective 2026-07-19 · created 2026-08-21

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

sha256:e9c77e13d7360ba95af50c41bebaba63929bdfb6223dab7070a589d73906a174
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
11
of 11 claims mapped
3
source dossiers
2
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
City of Belgrade — Secretariat for Transport
Actor types
city-government
Funding model
public
Funding description
Not recorded
Cost
≈RSD 2.8bn (≈€24M), phase 1
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

3 source dossiers

Yunex Traffic — Serbia (operator) yunextraffic.com · 5 linked claims

Open original source ↗

Stable source ID
src-0eed19fae50a8e48
Publisher
Name not classified · yunextraffic.com
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-07-19
Dossier created
2026-08-21
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Sitraffic Scala, 300+ intersections, tram prioritisation; delivered by the Siemens Mobility spin-off Yunex Traffic

Descriptive only — not page/paragraph exact
Claims linked
Balkan Green Energy News — Siemens Belgrade deal balkangreenenergynews.com · 6 linked claims

Open original source ↗

Stable source ID
src-b2fb2c3522545e89
Publisher
Name not classified · balkangreenenergynews.com
Type / language
web-page · language not classified
Published
2019-09-30
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-07-19
Dossier created
2026-08-21
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

30 Sep 2019 agreement: RSD 2.8bn, 322 of 650 intersections, 3-year project; projected 10–15% congestion/travel-time cut

Descriptive only — not page/paragraph exact
Claims linked
Kurir — 280 smart-signal intersections kurir.rs · 6 linked claims

Open original source ↗

Stable source ID
src-9b53068bf63ffc97
Publisher
Name not classified · kurir.rs
Type / language
web-page · language not classified
Published
2022-10-25
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-07-19
Dossier created
2026-08-21
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

25 Oct 2022: 280 of 322 connected; city analysis −26% on Bul. kralja Aleksandra, trams up to −40%

Descriptive only — not page/paragraph exact
Claims linked
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.