Sweden's Trafikverket Warns of Heatwave Impact: Road Asphalt Bleeding and Rail Closures

Sweden's transport authority Trafikverket has issued critical warnings and implemented restrictions due to the ongoing heatwave causing transportation hazards across the country. The extreme heat, with temperatures soaring to around 35 degrees Celsius, is leading to dangerous conditions both on roads and railways.

On the rail front, Trafikverket has escalated to a heightened preparedness level to address risks such as 'sun curves'—track bending caused by heat—and fire hazards stemming from sparks igniting nearby vegetation. As a result, certain train routes, especially in Värmland and Småland, will be closed or operate under slow speed limits. Notably, the rail stretch between Sunne and Torsby in Värmland is closed, and approximately 15 routes in Småland face similar restrictions.

Road users are warned about the emergence of "bleeding asphalt," a phenomenon where the binding agents in asphalt soften in the heat and rise to the surface, creating slippery, shiny black patches. Trafikverket’s national pavement coordinator, Jan-Erik Lundmark, explains that newly laid asphalt—less than two years old—is particularly vulnerable, especially on south-facing roads with more sun exposure. Although no incidents have been reported yet, Trafikverket is actively inspecting affected roads and urges drivers to exercise caution. Maintaining safe distances and reducing speed, even below posted limits, is advised to avoid accidents during the busy summer vacation period.

The combination of heat-induced track instability and road surface softening poses significant safety challenges. According to Johan Nilsson Holmqvist, a Trafikverket spokesperson, the agency is closely monitoring developments to protect travelers and minimize disruptions. Drivers are reminded that posted speed limits do not guarantee safe conditions under extreme heat and must adjust driving behavior accordingly.

As Sweden continues to face this intense heatwave, Trafikverket’s precautionary measures aim to mitigate transportation risks across key regions, highlighting the complex impact of climate extremes on national infrastructure.