The Saint-Cloud tunnel, located on the A13 motorway, closes to traffic in the Paris-to-provinces direction from Monday, November 16.
Linking the ring road to the west of the Paris suburbs and to Normandy, the structure sees nearly 80,000 motorists pass through each day in the affected direction alone.
It is one of the fundamental arteries of traffic in the Île-de-France region that thus ceases to operate in this direction, and for several months.
Le Figaro takes stock of the consequences of a construction project set to disrupt the daily lives of a great many motorists.
Until the end of the works, the north tube remains closed between the ring road and the Vaucresson interchange.
The reason: major reinforcement work on a structure dating from the 1930s, now aging and fragile.
The works are due to be completed on August 31, 2027.
The south tube, used in the provinces-to-Paris direction, remains open for most of the construction period, according to state services in Île-de-France.
Both directions of traffic will, however, be closed in July and August 2027, for the duration of viaduct maintenance, the same source indicates.
Until that deadline, drivers leaving the capital via the A13 lose a daily route toward the west of the urban area and toward Normandy.
For users traveling in the Paris-to-provinces direction, the closure is therefore long-term, until the planned completion of the structure's reinforcement.