Heat: Road championships use split on damaged roads

In recent weeks, extreme heat has placed significant strain on Germany’s infrastructure, prompting local authorities to take unconventional measures to mitigate damage. In response to rising temperatures, several road maintenance departments have begun using gravel—commonly associated with winter salting—as a preventive measure against heat-induced road degradation. This practice has been observed in parts of Nordsachsen, where officials confirmed that gravel was spread over damaged roads during the weekend. According to Uwe Schmidt, head of the road construction department in Nordsachsen, the winter service equipment typically used for spreading salt was repurposed for this task. The reduced traffic volume on weekends facilitated these operations, allowing workers to address vulnerable sections without disrupting normal traffic flow. Similarly, the state agency responsible for road management in Brandenburg has also implemented similar measures on heat-damaged roads.

The underlying issue lies in the physical properties of asphalt under intense heat. During periods of prolonged sunlight exposure, road surfaces can reach temperatures exceeding 60 degrees Celsius. When these surfaces fail to cool sufficiently during nighttime hours, the bitumen—a binding material within the asphalt—softens and rises to the surface, creating what experts refer to as “sweating pavement.” Under the pressure of vehicle traffic, this weakened asphalt can lead to depressions, grooves, bulges, or even dislodged pieces of asphalt. A spokesperson from the district of Nordsachsen explained that the soft asphalt can adhere to truck tires and be pulled away from the road surface. By applying gravel, which reduces the surface's sensitivity to heat, officials aim to prevent such occurrences. This method is considered a proactive strategy to protect particularly vulnerable road segments.

The current situation highlights a broader challenge faced by German infrastructure due to climate change. A recent study by the World Weather Attribution group concluded that heatwaves of this magnitude would have been nearly impossible 50 years ago, underscoring the accelerated warming experienced by Europe compared to other regions globally. This rapid temperature increase poses challenges for cities, transportation systems, and railways. Mobility researcher Andreas Knie emphasized that existing infrastructure is not designed to withstand such extreme conditions. Recent days saw multiple instances of road closures due to asphalt blistering caused by excessive heat, while the Deutsche Bahn urged citizens to avoid non-essential travel. Many long-distance trains, regional services, and trams were halted, including in cities like Leipzig, where melted sealing compound damaged tracks and switches. Similar issues were reported in Nuremberg and Würzburg.

The political discourse surrounding heat protection has intensified following these developments. Green Party representatives accused the federal government of failing in its climate efforts, calling it a “total failure” in addressing the crisis. Fraktionschefin Katharina Dröge called for immediate action, advocating for the installation of air conditioning units in nursing homes, hospitals, and schools, especially when combined with solar energy systems to manage energy costs effectively. However, implementing such measures faces financial constraints. Local governments bear primary responsibility for heat mitigation strategies, including decisions on sunshades, heat action plans, drinking fountains, and new green spaces. CDU politician Uwe Conradt noted that many municipalities struggle with budget deficits, making it difficult to allocate funds for essential heat protection initiatives.

The impact of extreme heat extends beyond infrastructure, placing immense pressure on healthcare systems. Each year, thousands of lives are lost due to heat-related causes, with over 8,000 deaths recorded during the summer of 2018 alone. Emergency services have reached their capacity limits, with reports of record numbers of emergency calls in cities like Dresden. Hospitals and care facilities face severe strains on both patients and staff. Uwe Janssens from the German Interdisciplinary Association for Intensive and Emergency Medicine stressed the need for substantial investment to make hospitals more resilient, estimating a requirement of between 21 and 30 billion euros. Despite these urgent needs, funding remains insufficient, with states reluctant to allocate necessary resources amid ongoing budget cuts.

As the debate continues, the focus shifts toward long-term solutions to adapt infrastructure and public health systems to increasingly frequent heatwaves. While immediate actions like gravel application offer temporary relief, systemic changes will be required to ensure sustainable resilience against future climatic extremes.