Detection of toxic gases CO, NO2 and opacimeters.
Madrid has 40 urban tunnels totaling 39 kilometers in length. The tunnels of the Madrid road network, in compliance with Royal Decree 635/2006, have been adapted to the necessary conditions and requirements after risk analysis. Obsolete ventilation control elements are replaced and existing ones are updated.
Cuatro Caminos Tunnel with 2 lanes in each direction, 500 meters long by 18 meters wide each and an approximate circulation of 80,000 vehicles. It starts and ends at Reina Victoria and Raimundo Fernández Villaverde street.
María de Molina Tunnel is the longest underground passage in Spain with 2,171 meters in length. It joins Paseo de la Castellana and calle Velázquez with the N-II, towards Madrid-Barcelona.
Tierno Galván Park Tunnel The Avenida del Planetario tunnel, under the Enrique Tierno Galván park, has carried out rehabilitation and structural improvement work in three phases. It runs between the streets of Embajadores and Méndez Álvaro and constitutes the southern closure of the second ring road of Madrid.
Cristo Rey Tunnel It begins in the Plaza de Cristo Rey, coming to the surface through Calle de Cea Bermúdez (entrance) and Avenida de Filipinas (exit).
Ríos Rosas Tunnel It runs under Ríos Rosas street and Filipinas avenue, joining at Guzmán el Bueno street and connecting with the Cristo Rey tunnel. This allows speeding up from the Paseo de la Castellana to the A Coruña highway.
In both the Cristo Rey tunnel and the Ríos Rosas tunnel, the linings, the protection plinth and the false ceilings are renewed and improved.
Ventisquero de la Condesa Tunnel This tunnel with two unidirectional tubes and its 2,906 meters in length, runs under the avenues of Cardenal Herrera Oria and Betanzos, connecting the avenue of Ventisquero de la Condesa with the two carriageways of the M-30 on the avenue of the Enlightenment. The configuration of the tunnel lining has been modified with a reinforced concrete wall and a 90cm high protection plinth, as well as waterproofing works.
Pio XII Tunnel The Pío XII tunnel connects the M-30 with Sinesio Delgado from Avenida de la Paz. 11,500 vehicles circulate through this relevant tunnel every day. After civil works, the problem of found leaks is solved.
For all of them, safety in the detection of toxic CO and NO2 gases is carried out with the DURGAS system approved by the Ministry of Industry, designed and manufactured by Durán Electrónica and opacimeters for environmental control, distributed by Durán Electrónica.