23.01.2026

Digital traffic flow analysis with anonymized mobility data

Building design

When traffic data lights up. Photo by Shekai on Unsplash.

Digital traffic flow analysis and anonymized mobility data are turning cities into learning organisms that anticipate traffic jams, reduce emissions and finally really understand mobility. If you want to know how cities in Germany, Austria and Switzerland are moving from a flood of data to traffic intelligence, you should read on now.

An explanation of how digital traffic flow analysis works with anonymized mobility data and the technologies behind it.
Detailed insights into the data sources, such as GPS, mobile networks and sensor technology, and their processing for traffic control.
Use cases: From real-time navigation to strategic traffic planning and sustainable urban development.
Opportunities for efficiency, climate protection and citizen friendliness – from smart traffic light control to the promotion of eco-mobility.
Legal and ethical challenges, in particular data protection, anonymization and data sovereignty.
Concrete examples of implementation from pioneering cities: What Hamburg, Zurich and Vienna are doing better – and where German cities need to catch up.
Risks of algorithmic bias, commercialization and digital patchwork.
The role of open urban platforms, governance and participatory urban development in digital traffic management.
Conclusion: Why the future of sustainable mobility must be data-based, transparent and democratic.

From data lane to traffic flow: How mobility data makes urban movements visible

Urban transportation planning is in the midst of a fundamental transformation. For a long time, traffic forecasts were based on spot counts, manual surveys and static models. However, the digitalization of mobility has opened up a new playing field: An unprecedented real-time picture of urban traffic flow is being created from anonymized movement data. Data from a wide variety of sources is bundled for this purpose: GPS signals from navigation devices, movement profiles from mobile phone networks, sensor data from traffic lights and street lamps, floating car data from fleet operators and even aggregated data from car-sharing or bike-sharing systems. The decisive factor is that this data does not record individual people, but rather movement patterns of entire streams – in other words, a collective, anonymized picture of the urban pulse.

The technical magic unfolds where these data streams meet intelligent algorithms. Data mining, pattern recognition and machine learning are used to recognize traffic events from millions of anonymized data records, identify bottlenecks and forecast how traffic will develop over the next few minutes, hours or days. The result: for the first time, cities have the opportunity to manage traffic proactively rather than reactively. Instead of laboriously chasing traffic jams, they can anticipate bottlenecks, suggest detour, intelligently control traffic lights and even send push notifications to travelers or logistics companies.

But how does the data get into the system? At the heart of this is the consistent anonymization and aggregation of the raw data. Modern processes ensure that no conclusions can be drawn about individual persons. For example, GPS tracks are summarized at grid level, mobile phone data is coarsened and alienated using statistical methods. At the same time, different sources are compared with each other: A traffic event is only considered valid if movements are confirmed by several systems. This minimizes sources of error and prevents manipulation.

The resulting traffic analysis platforms are by no means just playgrounds for tech nerds. They are essential tools for traffic planners, urban developers and energy experts. After all, road space is no longer just a place to pass through, but part of a highly dynamic mobility ecosystem that must constantly react to new requirements – be it roadworks, weather events, major events or new mobility services.

The real revolution lies in the fact that, for the first time, “soft” factors such as pedestrian traffic, bicycle mobility or multimodal interchange points can also be recorded quantitatively. This makes traffic flow analysis an integral part of sustainable urban development – and opens the door to data-based scenarios that go far beyond traditional traffic monitoring.

Technical basics: sensors, algorithms and the art of anonymization

If you really want to understand digital traffic flow analysis, you have to get to grips with the technical basics. This is because the data sources are just as diverse as the challenges they present. In addition to traditional induction loops and cameras at intersections, mobile devices – smartphones, on-board computers, networked vehicles – provide a large proportion of the movement data. Position data is recorded in real time via GPS, WLAN, Bluetooth or mobile communications. However, this raw data is initially anything but perfect: it is noisy, incomplete, of varying quality and initially not anonymous. This is where data processing comes in, extracting valuable information from the data chaos.

In the first step, the raw data is cleaned, synchronized and brought to a uniform coordinate system using pre-processing pipelines. This identifies outliers, corrects errors and avoids multiple counts. Spatial and temporal aggregation is crucial: movement data is aggregated to road sections, cells or traffic corridors so that individual lanes can no longer be reconstructed. Modern anonymization methods such as differential privacy or k-anonymity also ensure that no conclusions can be drawn about individuals – even in the case of very detailed analyses.

In the next step, machine learning models take over. They recognize patterns in the movement data, differentiate between different modes of transport – such as cars, trucks, bicycles and pedestrians – and identify typical causes of traffic jams or bottlenecks. Advanced algorithms can even differentiate between everyday and exceptional traffic, for example at major events, accidents or extreme weather conditions. The result is dynamic traffic models that not only depict the current situation, but also provide forecasts for the next few minutes, hours or days.

The fusion of different data sources plays a special role here. By combining data from vehicle fleets, local public transport, sharing services and stationary sensor technology, a holistic picture of urban traffic is created. Interoperable interfaces and open standards are of central importance here – this is the only way to avoid isolated solutions and proprietary data silos. In cities such as Zurich and Vienna, open urban data platforms are already being used to bundle a wide range of mobility data and make it available for analysis.

But despite all the enthusiasm for technology, without trust in anonymization and robust governance, acceptance is at risk of failing. That’s why data protection, transparency and traceability are not a side issue, but the backbone of successful digital traffic flow analyses. Only when citizens and companies can be sure that their data will not be misused will the necessary acceptance for data-based mobility control be achieved.

From traffic light control to urban development: applications and potentials

Digital traffic flow analyses are far more than just a tool for traffic engineers who like to optimize traffic lights. Their potential ranges from short-term deployment planning to strategic urban development. In day-to-day business, traffic control centers and municipal operators benefit from real-time data to avoid traffic jams, plan roadworks bypasses or dynamically control public transport. Traffic light phases can be automatically adapted to current traffic flows, detours can be intelligently signposted and bus lanes can be temporarily opened. In Hamburg and Munich, pilot projects are already underway in which traffic analysis platforms are linked to the city control centers – with measurable success in reducing congestion times and emissions.

In the medium term, anonymized mobility data opens up new possibilities for strategic traffic planning. Instead of relying on outdated counts and assumptions, planners can now simulate scenarios: How will traffic change as a result of a new cycle lane? What happens if a bridge is closed or a new neighborhood is developed? Which measures really help to strengthen the eco-mobility? By integrating mobility data, such questions can no longer be answered only theoretically, but based on evidence. This creates planning security and enables sustainable, resilient urban development.

Digital traffic flow analysis is particularly relevant in the context of climate protection. The transport sector is one of the main causes of CO₂ emissions in cities. Precise movement data can be used to identify and evaluate targeted measures to reduce emissions – such as promoting cycling, optimizing delivery traffic or intelligently linking sharing services. Cities such as Vienna and Copenhagen show how data-based transportation planning not only helps to formulate climate targets, but also to achieve them in a measurable way.

An often underestimated advantage is the opportunity to strengthen citizen participation and transparency. Open mobility data and interactive dashboards make traffic flows visible to everyone – not just experts in the town hall. Citizens, companies and initiatives can carry out their own analyses, make suggestions for improvements or participate in planning processes. This promotes an understanding of complex interrelationships and increases the acceptance of measures that sometimes also require changes in behavior.

Finally, digital traffic flow analysis enables iterative, learning urban development. Instead of decisions being made once and lasting for decades, measures can be continuously reviewed and adapted. This is an invaluable advantage, especially in times of disruptive changes – such as new mobility services, autonomous driving or changing working habits. Cities that seize this opportunity become more resilient, flexible and future-proof.

Challenges and risks: Data protection, governance and algorithmic bias

As great as the potential of digital traffic flow analysis is, the associated challenges must also be taken seriously. First and foremost is data protection. Although mobility data is consistently anonymized, the more detailed the analyses, the greater the risk of re-identification or misuse. This requires not only technical solutions, but also a clear legal and organizational framework. The European General Data Protection Regulation (GDPR) sets high hurdles that must be flanked in practice by privacy-by-design and regular audits.

A second, often underestimated risk lies in algorithmic bias. Machine learning and data-driven models are only as good as the data on which they are based. If certain traffic flows, user groups or districts are systematically under- or overrepresented, there is a risk of misdirection and social imbalances. Transparency, quality assurance and continuous review of the models are essential here. Cities must ensure that digital traffic analyses do not lead to an exacerbation of mobility inequalities – for example, by making already disadvantaged neighborhoods even more dependent.

The governance of mobility data is also a key challenge. Who controls the data platforms? Who determines which analyses are carried out and which data is openly accessible? Proprietary systems from tech companies carry the risk of cities becoming digitally dependent or of business interests being placed above the common good. This is why more and more cities are relying on open, interoperable urban data platforms that are controlled transparently and democratically. This is the only way to prevent the digitalization of transport from leading to the commercialization or privatization of public space.

Last but not least, public acceptance is a critical success factor. The fear of surveillance, data misuse or technocratic heteronomy is real – and must not be ignored. This makes it all the more important to communicate the benefits of digital traffic flow analysis in a comprehensible way, to enable participation and to consistently rule out misuse. Only if trust is created can the digitalization of mobility develop its full potential.

Finally, integration into existing urban planning is anything but trivial. Many municipalities are struggling with fragmentation, a lack of standardization and limited resources. Here, the federal government, federal states and associations are called upon to develop guidelines, standards and funding programs that facilitate the introduction of data-based transport planning and overcome the patchwork of isolated digital solutions.

Prospects for the DACH region: from pilot projects to a data-driven mobility revolution

In Germany, Austria and Switzerland, digital traffic flow analysis is no longer a distant vision of the future, but is being tested in numerous pilot projects. Hamburg, for example, uses anonymized movement data to dynamically adjust traffic lights in the city centre and minimize congestion times. In Zurich, mobility data from various sources is pooled in order to simulate the impact of new neighborhood developments on traffic and develop sustainable mobility concepts. Vienna relies on an open urban data platform that integrates not only traffic data, but also energy, climate and environmental data – and thus enables holistic, resilient urban development.

However, the reality is often still fragmented. While some major cities are leading the way with large budgets and technical expertise, many smaller municipalities are struggling with scarce resources, a lack of expertise and uncertainties regarding data protection. This is where knowledge transfer, best practice sharing and common standards are needed. Initiatives such as the Smart City model projects or the Digital Cities Network offer valuable support, but are often not enough to overcome the digital patchwork.

A key success factor is close cooperation between administration, business, science and civil society. Mobility data can only be translated into meaningful, sustainable solutions if all relevant players pull together. The involvement of citizens is particularly important here – not just as data providers, but as active co-creators. Transparent communication, open platforms and participatory processes are the basis for a data-driven, democratic mobility transition.

The greatest potential lies in linking different sectors. When traffic, climate, energy and environmental data are considered and analyzed together, completely new possibilities for integrated urban development arise. For example, heat islands, noise pollution and sources of emissions can be mapped together with traffic flows – and targeted measures can be developed to improve the quality of life. Cities that seize this opportunity will not only become smarter, but also more liveable, more sustainable and more resilient to the challenges of the 21st century.

The bottom line is that digital traffic flow analysis is not an end in itself, but a tool for a better, fairer and more sustainable city. It does not replace traditional planners, but makes them more capable, informed and creative. Investing in data expertise, open platforms and participatory processes today lays the foundations for the mobility of the future – and puts the city of tomorrow on the right track today.

Conclusion: data-driven traffic planning as the key to sustainable cities

Digital traffic flow analysis with anonymized mobility data marks a paradigm shift in urban mobility planning. It transforms punctual counts into continuous real-time analyses, reactive traffic control into proactive optimization and static city models into living, learning systems. The key to success lies in the combination of technical innovation, intelligent governance and consistent participation. Data protection and transparency are not burdensome obligations, but elementary prerequisites for acceptance and trust. Cities that take these principles to heart will benefit from more efficient traffic flows, lower emissions, a higher quality of life and a greater say for citizens and stakeholders. The future of mobility is data-based, connected and open – and it starts now. Those who want to shape it must have the courage to question old routines, forge new alliances and work together to leverage the potential of digitalization. This is the only way to turn the vision of a sustainable, resilient and democratic city into reality.

09.10.2025

Design, Translated: Branchennews

Searching for Clues on Slate Islands

Building design

The poetry collection "Schiefern" by Esther Kinsky explores the analogy between human memory and metamorphic rock. Photo: Suhrkamp — The poetry collection "Schiefern"

Esther Kinsky’s poetry collection *Schiefern* explores the analogy between human memory and metamorphic rock—a sensory quest for the inanimate.

Esther Kinsky’s poetry collection *Schiefern* explores the analogy between human memory and metamorphic rock. Photo: Suhrkamp

The poetry collection “Schiefern”

On the map, they appear as small specks off the west coast of Scotland—so small that it’s easy to overlook them. You have to seek them out specifically to find them. You don’t just stumble upon them. Scotland’s Inner Hebrides, an archipelago at the northernmost tip of the United Kingdom, are a popular travel destination. Those who come here yearn for the unspoiled, the wild, the rugged. For the salty wind that tangles itself in your hair and clothes, making them stiff. For the Atlantic, whose waves crash against the black rock. Gneiss. Granite. Basalt. Slate.

Esther Kinsky, a translator and poet who was awarded the “Hain. Geländeroman” in the fiction category, has dedicated a collection of poems with the simple yet evocative title “Schiefern” to slate and to the region where this sedimentary rock was quarried for centuries.

The quarries on the Slate Islands are still there, as are the remnants of an industry that has since been shut down. Kinsky embarks on a journey of discovery and captures her observations of nature in words that are enigmatic to decipher and sweep the reader away into the remoteness of the Inner Hebrides, to the black, roaring sea, above which the reader drifts, like an invisible figure floating in the space of thought that Kinsky weaves with her words.

It is precisely there, in this space of the imagination, that the analogies between something thoroughly lifeless and the human can be found. Few people appear in this three-part volume, yet it is by no means lacking in humanity. It is, in fact, quite astonishing how sensually one can write about waves carrying spray and “rocks with a / surface like petrified, gentle ripples” without slipping into kitschy romanticism.

“Nature Writing”

Since the 18th century, nature has inspired writers to make it the central protagonist of their works. In the English-speaking world, “Nature Writing” refers to the expansive literary descriptions of trees, meadows, flowers, and downpours. In German, the terms “Naturpoesie” (nature poetry) or “Naturlyrik” (nature verse) have become established. Esther Kinsky has stood out in literature for years with this kind of nature poetry.

In 2013, in *Naturschutzgebiet* (Nature Reserve), she wove together four cycles of poems about decay and growth, taking a neglected city park as her starting point. If one were to classify Kinsky’s work as “Nature Writing,” she would be quick to disagree. In an interview with Deutschlandfunk, she once said that she did not see herself as part of the tradition of nature writing. The term is too vague, she said, and too broad in what it encompasses and what it does not. “Nature writing” can be anything, she says. Why not her latest work, *Schiefern*, one might counter?

The Layers of Time

Early on in *Schiefern*, the word “memory” appears—“as a space of absences, moved by the transparent hand of unpredictable synapses and incalculable shifts of deposits in the slowly formed and deepened furrows and folds of the brain.” Kinsky is concerned with the layers of time that accumulate over memories. First very gently, then more clearly, she draws linguistic parallels between human memory and the history preserved on the surface of boulders, over which the tides and the passage of time have swept for millions of years.

The past lies preserved in the STEIN; it need only be read from its folds, as if the STEIN were an old, beloved elder whose weathered face bears the traces of life. Kinsky writes of “signs without hand or foot / in STEIN that no one / can make sense of / except as the greatest possible past.”

“Schiefern” could be the modern sequel to Adalbert Stifter’s 1853 collection of stories “Bunte Steine” and join the ranks of “Granit,” “Kalkstein,” and “Turmalin.” But as deceptively idyllic as Stifter’s detailed, Biedermeier-style depictions of nature are, Kinsky’s descriptions of the Slate Islands are anything but charming and cozy. The chill of the surroundings seeps through her words. There is a harshness in them that one would not want to imagine away.

Information about the book

Esther Kinsky: Schiefern.
Price: 24.00 euros
Austria: 24.70 euros
CH: 34.50 Swiss francs
Published: March 23, 2020
Hardcover, 103 pages
ISBN: 978-3-518-42921-1

30.10.2024

Project

Rakotzbrücke freshly restored

Building design

One of Lusatia’s most famous landmarks has been freshly renovated. The spectacular bridge structure is a highlight in the Azalea and Rhododendron Park in the east of Saxony.

One of Lusatia’s most famous landmarks has been freshly renovated. After years of renovation, the Rakotzbrücke is shining again. The spectacular bridge structure is an important highlight in the large azalea and rhododendron park in the east of Saxony.

The small village of Kromlauhas just over 300 inhabitants . Nevertheless, it can be seen in many photos. To be more precise, it is not the village that is the subject of the photos. Rather, it is the spectacular Rakotzbrücke bridge that fascinates. It is located in the middle of the large azalea and rhododendron park. The striking arch of this stone bridge is breathtaking. Today more than ever. After years of restoration, the bridge is once again visible.

Kromlau is a district of Gablenz in the district of Görlitz. Hardly anyone would know the village if it wasn’t home to the largest rhododendron park in Germany. It attracts many plant lovers. But many are also drawn there because it is home to the famous Rakotzbrücke bridge. The Kromlau Azalea and Rhododendron Park covers around 200 hectares. This large landscape park is the largest rhododendron park in Germany. Visitors do not have to pay admission. The Rakotzbrücke bridge and other stone sculptures are also accessible at all times.

Did you know? The park and flower festival has been held in the Kromlau Azalea and Rhododenron Park since 1965. Well over 30,000 visitors come to the annual festival, which takes place at Whitsun. By comparison, only just over 300 people live in Kromlau itself.

The beginnings at Gut Kromlau

A contemporary of the famous Hermann Ludwig Heinrich Prince von Pückler-Muskau acquired the Kromlau estate in 1842. Shortly afterwards, he began planting the first native and exotic trees and shrubs. He was also known as the little Pückler. As such, he spared no expense. He had ponds created on almost 800 acres and hills heaped up, which he crowned with oak trees. Rare trees and shrubs, mythological and rococo statues and basalt grottoes were created. The famous arch of the Rakotz Bridge is also one of them. It is made of boulders and basalt stone. The lord of the manor had this material brought in from various quarries in Saxon Switzerland and Bohemia. Ox carts mastered the transportation.

New owners, new activities

Friedrich Herrmann Rötschke exchanged the Kromlau estate with its Rakotzbrücke bridge for other building plots some 30 years after acquiring it. In the years that followed, ownership changed hands several times. It was not until 1889 that peace returned. Count von und zu Egloffstein-Arklitten acquired the site. He commissioned the horticultural inspector Georg Eichler to maintain the grounds. He added rhododendrons and azaleas to the existing trees and shrubs. Planted on a large scale, they contributed to the harmonious appearance of the park. The garden designer also planted certain flower varieties for sale. These generated welcome additional income. These in turn benefited the further development of the park. After the Second World War, the landscape park with the famous Rakotzbrücke bridge became public property. It was not until the mid-1960s that it received renewed attention. The park was once again maintained and reconstructed. The Rakotzbrücke bridge remained a special attraction.

You can see more impressions of the bridge in this video.

The Rakotz Bridge

Alongside Kromlau Castle, the Rakotz Bridge is one of the most important structures in the park. Its stone arch is unusually round. When its semicircle is reflected in the lake, a perfect circle appears in the water. Built from basalt and fieldstone, the bridge spans the Rakotzsee lake below over a length of 35 meters. Although numerous hiking trails cross the park, the bridge may no longer be entered.

Did you know? Only when the water level in the Rakotzsee is right does the reflection on the surface of the water complete the Rakotzbrücke into a perfect full circle. To prevent the water from gradually seeping into the ground, the lake bed was sealed with bentonite sealing sheets during the bridge renovation.

Rakotz Bridge equals Devil’s Bridge

The roots of the village of Kromlau lie in the Sorbian language. It is therefore not surprising that the name of the bridge is of Sorbian origin. Rakotz means crab in the Sorbian language. This is why the Rakotz Bridge is also known as the Devil’s Bridge. People used to believe that only the horned Beelzebub could build such a filigree bridge arch. Today, the bridge attracts photographers from all over the world. The photos usually also include the sculpture behind the bridge, the organ. The Rakotzbrücke’s reflective round arch made its biggest appearance in the fairytale film “The Sorcerer’s Apprentice”.

Renovation of the Rakotzbrücke

The municipality of Gablenz is now the owner of the landscape park. In 2018, it was awarded funding from various federal, state of Saxony and EU programs. Since then, a lot has changed at the Rakotzbrücke bridge and in the rhododendron park. Various types of construction work have been carried out. In addition to the renovation of the Rakotzbrücke bridge, a group of basalt columns and the grotto between the Rakotzbrücke bridge and the flight of steps, which collapsed in 1956, were also renovated. The repairs have now been completed. The construction fence has been removed and the associated lake has also been filled with water again. The scaffolding around the Rakotzbrücke bridge was removed in November 2020. After the bridge was renovated, the lake was sealed. Because only a constant water level can bring out the mirror effect perfectly.

Did you know? The renovation of the Rakotzbrücke bridge initially went according to plan, but had to be interrupted due to an unexpected visitor. Two protected bat species, the greater mouse-eared bat and the pug bat, were hibernating in their hiding places on the bridge, which is why the renovation was suspended for a few months so as not to disturb the animals.

In addition to the famous Rakotzbrücke bridge, other sculptures have been given a new lease of life. The Richterstuhl stone group and the historic bridge on the island pond in the west of the park have also been renovated. Although it was not possible to hold a park festival in early summer 2021 due to the coronavirus, many visitors came to the reopening of the park. The entire park was upgraded over a total of four years. This includes 8.5 kilometers of park paths. Forgotten paths around the island pond were also rebuilt. A fountain ensures that the pond is filled with water again. The new Asian Bridge is now reflected here. New plants have also been planted. The main parking lot at the entrance to Kromlau has been given an information point with public toilets. This important cultural site has now been secured for the coming decades.

Fancy another bridge? Let us show you one of the longest pedestrian suspension bridges in the world – the “Arouca 516” in the Arouca Geopark.