Spain has been dealing with the weather in the United Kingdom for a month and a half. And that forces us to rethink how we build our roads
Roads closed, prohibited overtaking and new speed restrictions, landslides that are swept away by a moving car or potholes that become sinkholes with the continued passage of vehicles. The roads in Spain have suffered greatly with a month and a half in which a succession of storms has barely given any respite. But is the fault of the investments or is it that we are not prepared for this climate? Potholes, sinkholes and closed roads. We have experienced a beginning of 2026 where news of intense snowfalls and continued rains have accumulated. And that has had an impact on the way we move. In some cases, airports have been forced to stop their activitythe trains have stopped due to the wind and, on the road, we have had all kinds of problems. Videos have become popular on social networks where a string of cars suffers the consequences of a sinkhole. Or the statements of those who affirm that in the same service area they have had to rescue a good handful of cars due to blowouts as a result of the poor condition of the roads. There is information that points to all types of roads: those managed by the Statethose that are from autonomous ownership and those that are from municipal ownership. We have had complaints for everyone. An unexpected event. Beyond the money dedicated to our roads, what seems clear is that a perfect storm has occurred: roads that should be better maintained and a succession of storms for which our roads are not prepared. If we look back, in the first 40 days of the year it rained in Spain triple the average recorded between 1991 and 2020. The recorded figure not only confirms that the swamps have filledalso calls into question to what extent Spain is becoming in a rainy country. And, above all, how we can prepare for climate change with more extreme weather events, repeated more frequently and further away from the typical climate of our country. Are we prepared? The truth is that our roads are prepared for something else. In Spain, roads are based on the PG3 regulations that draws on the European guidelines. Most of them respond to the premises aimed at building roads in hot climates. In fact, the next category is for a “medium” thermal zone and the next is considered “temperate.” This is important because as I said Francisco José Lucas Ochoatechnical and business development director at Repsol in his Twitter account, some time ago, on these roads A bitumen is used that is harder and withstands high temperatures better.. In the wetter climates A softer bitumen is used, as in the United Kingdom, but this can soften and melt if it is very hot. Our disadvantage? Asphalt resists high temperatures better but is more fragile and breaks more easily. This structure on our road leaves us, in most of the country (because high mountain roads are slightly different), roads that are less permeable to the passage of water. And the main objective has never been to resist humidity, it has been to resist extreme heat and fatigue due to the passage of numerous vehicles, since Spain is the second country in Europe with the highest heavy vehicle traffic. What consequences does it have? Asphalts designed for dry climates that have to suffer constant punishment from rain and humidity are more likely to accumulate water and encourage aquaplaning. But when the absorption of water is continuousthe problems are bigger. If the soil receives a constant amount of water, there comes a point where the layers beneath the asphalt remain constantly moist. This alters its ability to distribute loads, which is essential when you have a more rigid or less elastic asphalt like ours. This limited distribution of loads favors the fracture of the upper layer, generating potholes that end up becoming sinkholes both due to the action of the vehicles themselves and the punishment inflicted by the constant fall of water, further delving into the depth of the hole that is exposed. In addition, the useful life of asphalt is limited. Where it doesn’t rain and where it does rain. The added problem is that this train of storms has left a lot of rain where the roads are directly designed to withstand intense vehicle traffic circulating in a dry and hot climate. Andalusia and Extremadura have faced rains typical of Cantabria but, curiously, in Cantabria it has barely rained. In United Kingdomwhere the problem of water on the road is a constant, the construction of roads plays with the porosity of the asphalt, with the aim of making the soil capable of absorbing as much water as possible. A technique that is applied to the surface itself but in which the ditches are also taken into account so that the accumulated water does not infiltrate and, as we said, change the ideal load distribution. This type of asphalt is limited in Spain to very specific areaswith limited traffic and low risk of snow and smelt. In cold and humid climatesFor example, they have to deal with asphalt that is also more rigid but without losing sight of the accumulation of water. There the problem is not so much the latter as it is the formation of ice and the passage of vehicles equipped with studded tires on depending on which roads. If the road were as porous as in the United Kingdom, water would accumulate in the small gaps in the road surface and freeze, turning the road into a skating rink. Is there a solution? Yes and it seems to be underway. From 2021the Center for Studies and Experimentation of Public Works (CEDEX) coordinates the Transversal Working Group on Climate Change and Resilience in Roads. This group is analyzing the current situation of Spanish roads and infrastructure such as bridges, tunnels or aqueducts and what investments must be made to adapt them to the new meteorological reality of our country. Furthermore, in collaboration with CEDEX … Read more
