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Information bulletin
Nighttime closures of the Grand'Mare tunnel (RN28) - Nord-Ouest
Automatically translated from French ·
Published on Saturday, September 12, 2026 at 9:40 AM
From September 7 to 11, 2026, the Grand'Mare tunnel on RN28 will be closed at night for maintenance work. Heavy vehicles must use the so-called "large mesh" detour to avoid the city center of Bihorel.
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:
- Direction Rouen → Abbeville: route S1, via the exit ramp from the Grieu interchange, then RD43A, RD243A and RD43.
- Direction Abbeville → Rouen: route S2, from the Chapitre interchange, via RD43, RD243A and RD43A.
Specific detours for heavy vehicles:
- Direction Rouen → Abbeville (route S3): D418, N338, Flaubert Bridge, A150, A151, A29 toward Amiens, then A28 toward Abbeville.
- Direction Abbeville → Rouen (route S4): A28, A29 toward Le Havre, A151, A150, Flaubert Bridge, then N338.
This measure, resulting from a joint commitment by the State services, the Seine-Maritime Prefecture, and the DIRNO, aims to limit heavy goods vehicle transit in the urban areas of Bihorel, preventing their passage through the city center.
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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