His fellow competitor, currently fifth overall Paul Seixas echoed Pidcock's concerns: "I felt my front wheel slip in a corner without even understanding why. I think the tarmac was really melting because the descent was like an ice rink."
White phantom
The white areas are often created by limewash or a similar light-colored agent applied to the roadway.
The light material serves several functions. It reflects sunlight better than dark asphalt, which means the surface heats up less. At the same time, it can partially bind or dry out the sticky, oily components on the surface. This is intended to prevent the asphalt from softening even more in the heat.
"The coating reflects light. The aim is to keep the temperature below 50 degrees Celsius, which is a critical temperature for some surfaces," Tour road coordinator André Bancala told
RTBF Sport.
Bancala said local authorities, rather than ASO alone, decide where the treatment is required. Road inspectors identify sections considered vulnerable to heat, with particular attention paid to bends, descents and other technically difficult areas.
Tom Pidcock on Stage 10 of the 2026 Tour de France
The coating is not exclusively used for the Tour de France. According to Bancala, French road authorities are increasingly applying it during periods of intense heat because it uses less water than repeatedly cooling roads with water trucks.
Treating the road does not completely solve the problem. It can even create a new uncertainty. Riders do not always know exactly how the white area will feel under the tire.
Riders cause the crashes upon themselves?
If it is dry and evenly distributed, it can help. But if the material lies on the surface as a dusty film, it can feel slippery. If it gets damp, its behavior can change again. Transitions between normal asphalt, softened bitumen, and treated sections can also be treacherous.
"It is not slippery in itself," the Tour road coordinator countered, pointing to another problem instead: "These are difficult roads, and the descent of the Puy Mary is not easy to navigate."
According to Bancala, riders should take more into consideration the condition of used public roads and not race carelessly in the technical descents.
"The riders should not think they are on a Formula 1 circuit. When only one or two riders crash, it may simply be that their line was not ideal. We did not see a general wave of crashes," he concluded.