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The M-607 opens the third lane up to km 26 towards Colmenar Viejo: what's finished and what's missing

The partial opening on November 6th increases the capacity of the road as it passes through Tres Cantos, but does not bring the overall works to a close.

9 November 2026

Automatically translated from Spanish. Leer original en español

Horizontal cover M-607: editorial recreation of the expansion works and partial opening up to km 26. — AI-generated illustration · Photo: Recreación editorial asistida por IA; logotipo oficial TSM. No es fotografía documental.

The third lane of the M-607 now extends to kilometer 26 in the direction of Colmenar Viejo. The project continues in phases: another section is scheduled for December, and the extended contract deadline is November 30, 2027, a date different from the partial openings to traffic.

Updated: November 9, 2026.

What has opened and since when?
The M-607 has had a new third lane section since Friday, November 6, 2026, extending to kilometer marker 26, in the direction of Colmenar Viejo, near the exit to the future Tres Cantos hospital. This was announced by the Tres Cantos City Council based on information from the Community of Madrid. The opening is partial: it does not mean that the entire expansion is complete, nor that both directions have the same configuration. [1]

By April 30, 2026, the first section, between kilometer points 23.1 and 25, in both directions, had already entered service. Official references to approximately four kilometers opened at that time included both carriageways; they did not describe four consecutive kilometers of the route. [4]

What does the extension consist of and how much does it cost?
The project incorporates a third lane in each direction between Tres Cantos Norte and the southern bypass of Colmenar Viejo, at the junction with the M-618. The Colmenar Viejo City Council puts the project at 7.3 kilometers and the reported investment at 37.68 million euros. The regional reference to 14.6 kilometers of widening corresponds to adding both directions. [2, 11]

The CRTM places the affected area between kilometer points 23.1 and 30.6. This delimitation of the affected section and the communicated length of the extension should not be confused. [6]

The winning bidder is Ferrovial Construcción. The file includes an initial award of €29.13 million and a modification of €8.55 million, both including taxes, which explain the reported budget of approximately €37.68 million. This amount is not presented as the final settlement for the work. [10]

Beyond the asphalt: bike lanes, structures and wildlife
The project includes adapting the cycle lane, underpasses, service roads, walls, drainage systems, and replacing pipes. It also incorporates an ecoduct, an overpass designed to allow wildlife to cross the road with less risk of being hit by vehicles. [4, 5]

The technical monitoring report published by the Community of Madrid at the end of the summer describes progress in paving, structures, foundations of the ecoduct, and the Canal de Isabel II pipelines. It is a snapshot of that phase, not a certificate of the percentage completed as of November 9. The commissioning in November confirms further progress, but does not allow us to consider the other elements finished. [1, 5]

The work is being organized to accommodate both construction and traffic flow. Maintenance of the bike lane is part of the announced plan, with temporary detours; however, this does not mean that its final route is complete. [4]

Upcoming openings: forecasts, not confirmed inaugurations
The schedule communicated on October 22nd included an additional 2,100 meters during the first half of November: 1,700 towards Colmenar Viejo and 400 towards Madrid. The announcement of November 6th confirms the opening up to km 26 towards Colmenar, but does not separately detail the opening of those 400 meters towards Madrid. Therefore, they are neither considered open nor stated to remain closed. [1, 2]

Another 1,200-meter section is expected to be open by December 2026. The published schedule also indicates that sections 1, 2, and 3 will be operational by March 2027, with work then focusing on the final section. These are projected completion dates contingent on the progress of the construction and weather conditions, not guaranteed opening dates. [2, 9]

Why does November 2027 appear as the end date?
The order, signed on September 30, 2026, and published on October 6, extended the contractual deadline by eight months: from March 31 to November 30, 2027. The document cites issues with telecommunications, electrical installations, land availability, and the processing of a second project modification. The Administration considered the causes to be beyond the contractor's control. [3]

The Directorate General of Highways has explained that this maximum period does not imply waiting until November to use all the sections as they are completed. A distinction must be made between the contractual date and the partial openings: neither of the two, by itself, makes the forecasts a fait accompli. [8]

The file also documents a start in February 2021 and a suspension in March of that year, lifted in April 2025. The phase of work that has generated the current effects started on April 23, 2025. [3, 6, 12]

What bus drivers and passengers should keep in mind
The nighttime restrictions announced for November 2-6 were in preparation for this opening. They should not now be publicized as permanent closures or as restrictions in effect for all subsequent nights. New measures should be checked in the notices from the Highways Department, local councils, and the DGT (Spanish Directorate General of Traffic). [7, 13]

In sections of roadwork where indicated, the Colmenar Viejo City Council reminds drivers of the 60 km/h speed limit. Drivers must always obey the signage at each point, without extending this limit to the entire M-607 or interpreting the opening of the road as an automatic return to normal speed. [2]

For public transport, the CRTM's information sheet, updated on June 25, includes lines 717, 721, 722, 723, 724, 725, 726, 876, and N702, among others, that cover this section. It also includes the reinstatement of stop 20682, M-607 - Tres Cantos Station, in the direction of Colmenar Viejo. Before traveling, it is advisable to check the notices for each line; schedules or additional services should not be assumed unless confirmed. [6]

An important connection for the mountain municipalities
The road carries traffic from Tres Cantos and Colmenar Viejo, as well as from municipalities such as Soto del Real, Manzanares el Real, Miraflores de la Sierra, and Guadalix de la Sierra. The Community of Madrid has estimated the traffic volume on the affected section at over 62,000 vehicles per day. The opening aims to alleviate congestion, but the sources consulted did not provide a measurement of the time savings attributable to the new section. [4]

As of November 9, 2026: there is increased capacity in the Colmenar Viejo direction up to km 26; the entire project is still underway and the next openings remain subject to confirmation. [1, 2]

Sources consulted on 09/11/2026
[1] Tres Cantos City Council, municipal magazine 360y5. Opening up to km 26 (06/11/2026):https://360y5.es/finalizan-las-obras-del-tercer-carril-de-la-m-607-hasta-el-kilometro-26-en-sentido-colmenar-viejo/
[2] Colmenar Viejo Town Hall. Progress and opening schedule (22/10/2026):https://colmenarviejo.com/comunicacion/noticias/comunidad-de-madrid-y-ayuntamiento-actualizan-los-avances-de-las-obras-del-tercer-carril-m-607
[3] Community of Madrid. Order extending the deadline, signed on 30/09/2026 and published on 06/10/2026:https://contratos-publicos.comunidad.madrid/medias/obr286702019ordenampliacionplazopdf/download
[4] Community of Madrid. Opening of the first section (30/04/2026):https://www.comunidad.madrid/noticias/2026/04/30/diaz-ayuso-apertura-primer-tramo-ampliacion-m-607-trabajamos-carreteras-sean-seguras-mejor-conservadas
[5] Community of Madrid. Technical monitoring of the works; contains parts from different dates:https://www.comunidad.madrid/carreteras/informacion-actualizada-obras-tercer-carril-m-607
[6] CRTM. Service disruptions; last update indicated: 25/06/2026:https://crtm.es/transporte-publico-obras-m607
[7] Tres Cantos City Council, municipal magazine 360y5. Courts from November 2 to 6 (30/10/2026):https://360y5.es/nuevos-trabajos-de-asfaltado-en-la-m-607-provocaran-cortes-nocturnos-y-desvios-por-la-ciudad-la-proxima-semana/
[8] SER Madrid Norte. Interview with the Director General of Highways on the contractual deadline and openings (09/10/2026):https://cadenaser.com/cmadrid/2026/10/09/la-comunidad-de-madrid-aclara-que-en-marzo-de-2027-solo-quedara-un-kilometro-por-abrir-de-la-m-607-ser-madrid-norte/
[9] 20 minutes. Independent contrast of the opening and forecast for sections 1, 2 and 3 (06/11/2026):https://www.20minutos.es/madrid/obra-m-607-avanza-con-apertura-tercer-carril-hasta-km-26-sentido-colmenar-viejo_7058070_0.html
[10] Community of Madrid. Contract sheet A/OBR-028670/2019, award and modification:https://contratos-publicos.comunidad.madrid/contrato-publico/obras-construccion-tercer-carril-carretera-m-607-tramo-tres-cantos-norte-variante
[11] Community of Madrid. Extended budget and scope of action (26/02/2025):https://www.comunidad.madrid/noticias/2025/02/26/comunidad-madrid-aumenta-376-millones-inversion-construir-tercer-carril-m-607-tres-cantos-colmenar-viejo
[12] Community of Madrid. Start of the construction phase in April 2025 (11/04/2025):https://www.comunidad.madrid/noticias/2025/04/11/comunidad-madrid-inicia-23-abril-obras-tercer-carril-m-607-tres-cantos-colmenar-viejo
[13] DGT. Map of incidents; check warnings before traveling:https://etraffic.dgt.es/etrafficWEB/

Partial opening up to km 26 towards Colmenar Viejo, from November 6, 2026; road recreation. — AI-generated illustration · Photo: Recreación editorial generada con IA; logotipo oficial TSM superpuesto. No es fotografía documental de la M-607.

Figures for the M-607 expansion: 7.3 kilometers of work and reported investment of 37.68 million; recreation of machinery. — AI-generated illustration · Photo: Recreación editorial generada con IA; logotipo oficial TSM superpuesto. No es fotografía documental de la M-607.

The expansion includes wildlife crossings and environmental integration measures; illustrative recreation of an underpass. — AI-generated illustration · Photo: Recreación editorial generada con IA; logotipo oficial TSM superpuesto. No es fotografía documental de la M-607.

Safety on the M-607 roadworks: pay attention to the posted speed limits, warnings and traffic conditions; signage recreation. — AI-generated illustration · Photo: Recreación editorial generada con IA; logotipo oficial TSM superpuesto. No es fotografía documental de la M-607.

Connection of the M-607 with Tres Cantos, Colmenar Viejo and the Sierra; expected benefits of capacity and mobility. — AI-generated illustration · Photo: Recreación editorial generada con IA; logotipo oficial TSM superpuesto. No es fotografía documental de la M-607.

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