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Information bulletin
Night closures of the Grand'Mare tunnel (Pas-de-Calais)
Automatically translated from French ·
Published on Saturday, September 12, 2026 at 9:57 AM
From September 7 to 11, 2026, the Grand'Mare tunnel on RN28 will be closed at night for maintenance work. Detours S1-S2 are in place for light vehicles and S3-S4 for heavy vehicles. These measures aim to limit heavy traffic in urban areas.
The interdepartmental road authority Nord-Ouest (DIRNO) is carrying out electrical maintenance, installing dynamic signage, maintaining communication networks, and conducting quarterly maintenance on the Grand'Mare tunnel on RN28.
Night closures of the tunnel:
- Monday 7 to Tuesday 8 September 2026, from 8:30 p.m. to 6:00 a.m.: closure in the Rouen → Abbeville direction (upward tube).
- Tuesday 8 to Thursday 10 September 2026, from 8:30 p.m. to 6:00 a.m.: closure in both directions.
- Thursday 10 to Friday 11 September 2026, from 8:30 p.m. to 6:00 a.m.: closure in the Abbeville → Rouen direction (downward tube).
Detours for light vehicles:
- Rouen → Abbeville: route S1, via the exit ramp from the Grieu interchange, then RD43A, RD243A and RD43.
- Abbeville → Rouen: route S2, from the Chapitre interchange, via RD43, RD243A and RD43A.
Specific detours for heavy goods vehicles:
- Rouen → Abbeville (S3): D418, N338, Flaubert Bridge, A150, A151, A29 toward Amiens, then A28 toward Abbeville.
- Abbeville → Rouen (S4): A28, A29 toward Le Havre, A151, A150, Flaubert Bridge, then N338.
These measures, implemented by the State services, the Seine-Maritime Prefecture and DIRNO, aim to limit heavy goods vehicle transit through the urban area of Bihorel and to prevent through traffic from crossing the city center of Bihorel.
Detour routes are permanently indicated by signage S1-S3 (Rouen → Abbeville direction) and S2-S4 (Abbeville → Rouen direction), as well as by variable message signs.
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