A Radical Change in Madrid's Mobility
The Spanish capital is experiencing one of the most significant urban transformations in the last two decades. The underground project of Castellana, along with other key works such as those on the A-5 and Ventas, is underway and promises to revolutionise mobility in Madrid. With notable progress in the works, the City Council has reaffirmed its commitment to meet the established deadlines, ensuring that these projects will not only alleviate traffic but also improve the quality of life for citizens.
Since the start of these projects in 2025, significant progress has been observed. In particular, the underground project of Castellana has exceeded expectations and is ahead of the planned schedule. According to statements from Mayor José Luis Martínez-Almeida, engineers have highlighted that the work is progressing "at full speed", which is good news for Madrileños who have suffered from traffic congestion for years.
The Future Castellana Park
As the underground works develop, plans are also in place to begin landscaping the new Castellana Park. This green space will cover 70,000 square metres and will feature 787 new trees, bike lanes, and recreational areas for children. The intention is to transform this area into a green lung for the city, where there were previously four lanes dedicated to vehicular traffic.
The design of the new park not only aims to beautify the urban environment; it also seeks to enhance the environmental sustainability of Madrid. With traffic restricted to local vehicles and public transport on the surface, it is expected to significantly reduce pollutant emissions in this central area.
Future Projections
By the end of 2026, citizens will be able to travel through the tunnel constructed under Castellana. This tunnel will feature three lanes in each direction and will allow for smooth connections between different key points in Madrid. Additionally, a second underground level will be prepared to serve as a future connection with nearby neighbourhoods such as Begoña and Madrid Nuevo Norte.
Not only is Castellana advancing; works on Ventas and A-5 are also scheduled to make significant strides this April. In particular, A-5 has already completed more than two kilometres of the planned underground work and is working to connect them efficiently before next November.
Commitment to Citizens
As these works continue their course, Almeida assures that his administration is committed to minimising the inconveniences caused by these urban transformations while working to substantially improve the quality of life in Madrid. The promise is clear: "To start improving the lives" of all Madrileños.





