1001 Smart Cities
🇷🇸 Belgrade

Belgrade Sitraffic Adaptive Traffic Control

🤖 AI-generated summary of the sources below · 🔎 Last verified · ◆ 11 sourced claims, none individually verified yet

This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.

How this atlas is made · What “last verified” means · What “source-checked” means · The full record behind this page

✎ Corrected 21 Aug 2026 3 claims added. What changed →

Since 2019 Belgrade has been retrofitting its junctions with Siemens Mobility's Sitraffic Scala adaptive control, which retimes signals in real time from live traffic data and gives trams priority. 280 of the city's roughly 650 signalised intersections were connected by late 2022, with the rollout continuing under Yunex Traffic.

Live 📅 since 2019
Outcome🔄 Ongoing
Evidence📰 Media
what does this mean?The strongest source is press reporting; no primary evaluation was located. It grades who did the looking — not how well the project went. All four grades →
Run byCity of Belgrade — Secretariat for Transport
Scale🏙️ City-wide
Cost≈RSD 2.8bn (≈€24M), phase 1

📊 Impact

City analysis reported travel time and stops together in one direction of Bulevar kralja Aleksandra cut about 26%, and tram journey times on Ruzveltova shortened by up to 40%.

🎓 Lesson

The 322-junction rollout, first promised for 2021, was still well short of that count in late 2022 — adaptive retrofits across a legacy signal network take longer than headline timelines suggest.

🚲 MobilityTraffic managementPublic transportSensors & IoT

Sources

↗ Yunex Traffic — Serbia (operator)Sitraffic Scala, 300+ intersections, tram prioritisation; delivered by the Siemens Mobility spin-off Yunex Traffic
↗ Balkan Green Energy News — Siemens Belgrade deal30 Sep 2019 agreement: RSD 2.8bn, 322 of 650 intersections, 3-year project; projected 10–15% congestion/travel-time cut
↗ Kurir — 280 smart-signal intersections25 Oct 2022: 280 of 322 connected; city analysis −26% on Bul. kralja Aleksandra, trams up to −40%
Show your work What this page rests on and what it can’t tell you · all 11 claims with their sources · the forensic record

Evidence Passport · public beta 11 addressable claims, 3 source dossiers, one permanent baseline. The passport is unreviewed — an AI-assisted structural migration, not a human or expert endorsement. Every revision keeps a permanent copy under revision history.

Inspect the claims, one by one — verbatim text, sources and caveats for all 11

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-8eb237a6526bafe6 quantitative
City analysis reported travel time and stops together in one direction of 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 source's 26% covers travel time and number of stops together, in one direction only — the entry previously attributed it to morning travel time alone.

Sources carrying this claim

  1. Kurir — 280 smart-signal intersections
Claim 8 clm-4b96554262f421c9 quantitative
tram journey times on Ruzveltova 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 40% applies to Ruzveltova specifically, not to prioritised routes in general.

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-26628e3674890920 quantitative
was still well short of that count in late 2022
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 describes a delay of several years: the gap between the 2021 target and Kurir's October 2022 count of 280 is about one year.

Sources carrying this claim

  1. Kurir — 280 smart-signal intersections
  2. Yunex Traffic — Serbia (operator)
Forensic record — source dossiers, gaps, hashes and the exact revision this page renders

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-unsourced-text-correction effective 2026-07-19 · created 2026-08-21

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

sha256:10b2f4dc0614665a6e0849895099a94fa80f8c32a34040f5faae1c37b491aeee
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.

Continue exploring

Compare this project

🇷🇴 Bucharest Traffic Management System (BTMS) · Bucharest Neighbouring capitals, adaptive signals: Belgrade's Siemens system gives trams priority (2019); Bucharest's central control runs since 2008. 🇦🇺 SCATS — Sydney Coordinated Adaptive Traffic System · Sydney SCATS has retimed Sydney's signals centrally since 1975; Belgrade brought the same idea to 280+ junctions via Siemens (2019). 🇺🇸 Surtrac AI Traffic Signals · Pittsburgh Central vs local: Belgrade retimes signals from one Siemens system (2019); Pittsburgh's Surtrac lets junctions negotiate locally (2012).

Explore the wider context

🚦 Asphalt or algorithms🚦 Traffic management guide🏙️ Belgrade city profile🚲 Mobility projects📖 Adaptive traffic signals📖 Automated speed enforcement (speed cameras)📖 Congestion pricing
📎 Cite this project

1001 Smart Cities (2026). “Belgrade Sitraffic Adaptive Traffic Control” — Belgrade, Serbia. The Smart City Atlas. https://1001smartcities.org/projects/belgrade-adaptive-traffic/ (last verified 2026-07-19). Data: CC BY 4.0.

The underlying data is free to reuse with attribution — see the open data page.

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