Anyone navigating through the city in summer asks Google Maps for the quickest route – not the most pleasant one. But how much quality of life falls by the wayside when navigation systems ignore heat islands and shaded areas? Cooling routes could change that. But who is really taking the well-being factor seriously – and how far have we come in the DACH region with integrating it into digital urban mobility?
- Definition and importance of cooling routes in urban planning
- Technical basics: data sources, sensors and algorithms
- Practical examples from Germany, Austria and Switzerland
- Challenges of integration into navigation systems
- Well-being as a new benchmark for urban mobility
- Potentials and risks of data-driven cooling routes
- Strategies for cooperation between planners, tech providers and cities
- Prospects for a climate-resilient, liveable city
Cooling routes: What’s behind the new trend?
Anyone who walks in Berlin, Vienna or Zurich at the height of summer will be familiar with the problem: asphalt surfaces shimmer with heat, concrete walls store heat and getting from A to B feels like an involuntary sauna session. Traditional navigation, whether with a smartphone or in a car, has so far only known two parameters: fast and direct. But the consequences of urban heat islands have long been more than just a comfort problem. They affect health, quality of life and ultimately also social justice in urban areas. This is precisely where so-called cooling routes come in: Route recommendations that are not only optimized for speed, but explicitly for the thermal well-being of users.
The principle sounds simple, but is highly ambitious in terms of technology and planning. Instead of just reacting to traffic jam or road works reports, cooling routes take a variety of other factors into account: shadows cast by trees and buildings, current and forecast temperature data, humidity values, green areas, water surfaces, wind currents and even surface temperatures. The aim is to find the most pleasant – i.e. coolest and at the same time safest – route through the urban undergrowth. This is not about detours for the sake of it, but about real quality of life, which can be existentially important for many population groups, such as senior citizens or families with children.
The idea is not new, but only the latest advances in sensor technology, urban data processing and artificial intelligence are making it practicable. Cities such as Vienna and Paris are already experimenting with the first prototypes, while in German municipalities the topic is often still stuck on the drawing board – or is torn between responsibilities and data protection concerns. Current hot spells and growing urbanization show that the need for smart, climate-friendly mobility services is increasing rapidly.
Cooling routes are far more than just a digital gimmick for technology fans. They are an expression of a paradigm shift in dealing with urban climate: away from pure infrastructure planning and towards the proactive design of urban quality of life. Anyone who believes that route guidance is a purely logistical task is overlooking the potential that lies in linking climate data, urban design and digital navigation.
But as convincing as the concept sounds, the integration of cooling routes into existing navigation systems is anything but trivial. It requires a new planning culture, cooperation between the city, tech companies and science – and not least a clear attitude: is well-being in the city really more than just a marketing promise?
The technical basis: data, sensors and algorithms for cooling routes
Establishing cooling routes as an integral part of urban navigation requires a whole new wealth of data – and the ability to make it usable in real time. While conventional navigation systems are based on fixed map data and traffic reports, cooling routes need to access a wide range of environmental and climate data. This initially includes meteorological data such as temperature, humidity, UV radiation and wind speed. These are often recorded by urban weather stations, but increasingly also by sensor networks in the street. LoRaWAN sensors, such as those used in Hamburg or Zurich, provide precise measurements right down to the sidewalk – a real quantum leap compared to the coarse-grained data of the past.
But sensor data alone is not enough. The integration of geographic information systems (GIS), which provide detailed information on road width, surface materials, greenery, water areas and building heights, is crucial. This is the only way to precisely model the shadows cast by trees and façades, the course of fresh air corridors or the reflection of sunlight. Cities such as Vienna and Munich have already set up their own data platforms that can serve as a basis for developing cooling routes.
However, the real magic happens in the algorithm: modern route planners that are optimized for well-being have to weigh up a large number of competing factors. Should a route be slightly longer but significantly cooler? Is the shade on a particular route reliable or only available at certain times of day? How does the surface temperature affect subjective perception? This is where machine learning and simulation techniques are used to derive patterns from historical and current data and create forecasts. The challenge: the algorithm must not only deliver technical precision, but also map the complex interplay of climate comfort, safety and accessibility.
One factor that is often underestimated is the availability and quality of the data. While there is usually good climate data for main roads, many side streets, parks or backyards are still blank spots on the digital weather map. The integration of crowdsourcing approaches – for example by using sensor data from smartphones or wearables – can help here, but raises new questions about data protection and data sovereignty. Who is allowed to use which data and how? And how can sensitive location or health data be prevented from becoming a commodity?
Making cooling routes suitable for mass use therefore requires not only technical excellence, but also robust governance structures and close integration of urban planning, software development and data protection law. Only then can cooling routes develop their full potential – and actually integrate well-being into digital urban mobility.
Practical check: Who is integrating cooling routes – and what do the first applications look like?
A look at the practice shows: The integration of cooling routes into navigation systems is still in its infancy in the DACH region – but there are some promising initial approaches. Vienna is considered a pioneer: with the “Cool Vienna” project, the city presented a digital route planner back in 2021 that recommends the coolest routes through the city for pedestrians. It is based on high-resolution climate data, which is linked to information on shade zones, drinking fountains and green spaces. The application is directly integrated into the city service and is being continuously developed. Zurich is also working on similar concepts: in addition to temperature data, wind tunnel analyses and real-time measurements from the Smart City network are also incorporated into the navigation system.
In Germany, development has so far been more fragmented. While individual cities – such as Munich, Stuttgart and Frankfurt – have set up pilot projects for heat-resilient urban districts, there is usually still a lack of consistent integration into existing mobility apps. The Fraunhofer Institute is working with several local authorities to develop an open data standard for urban climate routes, but there is still a long way to go before it is widely used. One reason for this is that major navigation providers such as Google and Apple have so far been reluctant to integrate local climate data into their algorithms. This shows how important open interfaces and close cooperation between city authorities, research and the tech industry are.
Interest is also growing in Switzerland: Zurich, Basel and Bern are currently testing the linking of pedestrian routes with real-time climate data, in some cases even in combination with augmented reality features that allow users to visualize the progression of shadows on their smartphones. The aim is not only to plan heat resilience, but to make it tangible in everyday life. Initial user feedback shows that acceptance increases when the applications work intuitively and reliably – and when they offer real added value compared to traditional navigation.
An exciting side effect: the development of cooling routes also promotes cooperation between traffic planning, environmental agencies and urban development. Only when information on tree populations, surface temperatures, air pollutants and footpath networks is pooled can a complete picture be created for planning purposes. This not only creates better routes, but also provides impetus for improving the urban infrastructure – for example through targeted replanting, drinking water points or temporary shade providers.
Despite all the progress, the big challenge remains: how can cooling routes be turned from a niche into a standard? This requires clear political guidelines, integration into existing smart city strategies – and not least the courage to push through new forms of urban mobility, even against the established routines of traffic planning.
Well-being as a new benchmark: opportunities, risks and prospects
The integration of cooling routes into navigation systems is more than just an update for technology fans – it marks a paradigm shift in urban planning. Instead of speed and efficiency, the focus is shifting to people’s subjective well-being. This has far-reaching implications, not only for technical development, but also for the self-image of urban development. Well-being is a complex construct: it encompasses temperature comfort, quality of stay, accessibility, safety and even social aspects such as communication and participation. Anyone planning cooling routes must take all these dimensions into account and map them transparently.
But with the new focus on well-being, the requirements are also growing. The algorithms must be fair, comprehensible and adaptive. It must not happen that certain neighborhoods are systematically disadvantaged because, for example, their climate data is less well collected or their streets are less green. There is a risk of an algorithmic bias that cements or even exacerbates existing inequalities in urban space. To counteract this, we need open, verifiable systems and the consistent involvement of all relevant stakeholders – from the administration to the scientific community to the citizens themselves.
Another critical point is the commercialization of urban climate data. If navigation providers offer exclusive data access or premium functions for cooling routes, there is a risk of two-tier mobility: those who pay will walk in the shade, those who don’t will stay in the sun. That would be the opposite of what climate-resilient urban development aims to achieve. Cities and municipalities are called upon to create open data standards and to see the integration of feel-good routes as a common good – not as a luxury product.
However, the potential is enormous: cooling routes can not only make everyday life easier in hot summers, but also contribute to preventive healthcare, promote walking and cycling and strengthen social participation. They make climate change visible in everyday life and show concrete adaptation strategies. For planning, they open up new possibilities for scenario development, for example by showing how targeted greening measures or water features can improve the urban climate and mobility.
In the long term, cooling routes could become standard in every navigation application – provided that cities and providers understand well-being as a central leitmotif of urban mobility. Then navigation will no longer just be a question of efficiency, but a question of quality of life – and thus a genuine, climate-conscious innovation in urban space.
From vision to implementation: what planners, cities and tech providers need to do now
The path from the idea to the widespread implementation of cooling routes is rocky, but feasible – if the relevant players pull together. For planners, this means that urban development must no longer be seen solely as a question of land use and traffic management, but as a holistic design of the urban microclimate. New alliances are needed between urban climatology, mobility management, digitalization and participation. Landscape architects and urban designers in particular can contribute their expertise here by specifically integrating shade structures, green axes and fresh air corridors into public spaces – and actively providing the data for this.
Cities and municipalities are called upon to create open data platforms and interfaces. Innovative navigation apps can only be created if climate data, traffic information and geodata are freely accessible and machine-readable. It is worth taking a look at Scandinavia or the Netherlands, where open urban platforms have long been standard. At the same time, data protection and data sovereignty must remain a top priority in order to secure the public’s trust and prevent uncontrolled commercialization.
Tech providers, in turn, must have the courage to open up their algorithms to new feel-good parameters – and embrace the complexity of urban reality. This means moving away from rigid standard routes and towards flexible, learning systems that take equal account of climate, safety and quality of stay. It requires interdisciplinary teams that bring together urban climatology, software development and UX design – and the willingness to set new standards together with the cities.
One key to success lies in the active involvement of users. Only if the applications are intuitive, transparent and comprehensible will they be widely accepted. Feedback loops, participative workshops and open pilot projects are just as important here as traditional public relations work. Cooling routes must not remain a niche product for technology enthusiasts, but must be established as a natural part of urban mobility.
The result is a city that is not only built, but lived – and in which the well-being of all people is the focus. The integration of cooling routes into navigation systems is an important building block for the climate-resilient, liveable city of tomorrow. Those who act now are setting standards – and showing that urban planning can do more than just asphalt and traffic lights.
Conclusion: Cooling routes are more than just a feature – they are a quantum leap for urban well-being
Cooling routes in navigation systems mark the dawn of a new era of urban mobility – one in which people’s well-being is finally given the importance it deserves. They combine technological innovation, climate adaptation and social participation in a holistic approach that goes far beyond traditional transportation planning. The challenges are manifold: from data collection and the development of fair algorithms to open, participatory governance. But the opportunities are at least as great. Cooling routes not only make the city more pleasant, but also fairer, healthier and more sustainable.
To realize their full potential, they need the courage to cooperate, a willingness to rethink and a clear political agenda. Cities, planners and tech providers must work together to set new standards – for navigation that no longer just leads from A to B, but aims to improve quality of life. Because in the end, it’s not how quickly we get through the city that counts, but how we feel while doing so. And the cool route clearly has what it takes to become the new gold standard.
