Val-d'Oise (95): The A16 and RD922 closed for several nights, dates and detours

Heads up for regular users of the A16 in Val-d'Oise. From October 19 to November 20, 2026, maintenance work will trigger several nightly closures of the highway and certain access ramps near L'Isle-Adam. Here are the dates, schedules and detours you need to know to avoid any surprises.

Drivers on the A16 motorway, in the Val-d'Oise (95), will need to adjust their routes for several weeks. From Monday, October 19 through Friday, November 20, 2026, the Sanef group will carry out maintenance between the A16/RN184 interchange and the Isle-Adam North exit (No. 11). Several stretches of road and access ramps will be temporarily closed to traffic, only at night, from 9 p.m. to 5 a.m., excluding weekends.

On the agenda for this intervention: the renovation of 2 km of roadway and the replacement of expansion joints on 2 bridges. These works are designed to help the structures adapt to temperature variations and movements. The works should improve the condition of the roadway and ensure safe conditions on this busy corridor in northern Île-de-France.

What closures are planned on the A16?

The project will unfold in several phases, with restrictions changing depending on the dates. Motorists heading toward Paris will be particularly affected at the outset of the works.

From October 19 to 22, 9 p.m. to 5 a.m.

The A16 is closed in the Boulogne-sur-Mer to Paris direction, with a mandatory exit at junction 12 Chambly.
The on-ramps to the A16 toward Paris from exit 11, L’Isle-Adam Nord, are closed, including the accesses from RD301 and RD922.

To access the A16 toward Paris, drivers will need to take the A16/RN104 interchange.

From October 22 to November 6, 9 p.m. – 5 a.m.

Closure of the on-ramps to the A16 toward Paris from the RD301, at Exit 11 (L'Isle-Adam Nord) interchange.

Once again, motorists will need to use the A16/RN104 interchange to get onto the motorway.

The RD922 road is also closed between L'Isle-Adam and Mours

Disruptions won’t be limited to the motorway. From November 2 to 20, between 9 p.m. and 5 a.m., the RD922 will also be closed between the two roundabouts connecting the towns of L'Isle-Adam and Mours. Two detour routes are planned depending on your destination:

How to join Mours:

Take the A16 toward Paris, make a U-turn at the A16/RN184 interchange, then rejoin the A16 toward Amiens to the L'Isle-Adam Nord exit (No. 11).

How to reach L'Isle-Adam:

Take the RD301, make a U-turn in the Persan industrial zone, then continue on the RD301 toward L'Isle-Adam.

These detours could extend travel times for residents and motorists moving between the municipalities in the area, particularly in the evening or in the early hours.

How to monitor roadworks and traffic conditions?

To minimize disruption, Sanef has decided to carry out these works solely at night and outside weekends. Daytime traffic conditions must therefore be preserved, subject to potential adjustments related to the construction work. The announced dates and times remain subject to change depending on weather conditions or technical constraints.

Before setting off, motorists can check the site autoroutes.sanef.com, tune in to Sanef 107.7, or call the customer service line at 09 708 08 709 for the latest updates on closures.

If you need to travel in the Isle-Adam, Chambly or Persan area over the coming weeks, it’s wise to check the traffic conditions before you set off, especially for night-time travel!

This page may contain AI-assisted elements, more information here.