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Information bulletin
Nighttime closures of the Grand’Mare tunnel on RN28
Automatically translated from French ·
Published on Saturday, September 12, 2026 at 12:53 PM
From September 16 to 18, 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 Bihorel.
The interdepartmental road authority Nord-Ouest (DIRNO) is carrying out electrical maintenance, installation of dynamic signage, maintenance of communication networks, and quarterly maintenance of the Grand’Mare tunnel on RN28.
Night closures of the tunnel:
- Night from Wednesday 16 to Thursday 17 September 2026, from 8:30 p.m. to 6:00 a.m.: tunnel closure in the Rouen → Abbeville direction (upstream tube).
- Night from Thursday 17 to Friday 18 September 2026, from 8:30 p.m. to 6:00 a.m.: tunnel closure in the Abbeville → Rouen direction (downstream tube).
Detours for light vehicles:
- Rouen → Abbeville direction: route S1, via the exit ramp from the Grieu interchange, then RD43A, RD243A, and RD43.
- Sens Abbeville → Rouen: route S2, from the Chapitre interchange, via RD43, RD243A and RD43A.
Specific detours for heavy vehicles:
- These vehicles may not use routes S1 or S2.
- A mandatory "large loop" detour is in effect:
- 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, taken by the State services, the Seine-Maritime Prefecture and DIRNO, aim to limit heavy 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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