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Information bulletin
Nighttime closures of the Grand’Mare tunnel on RN28 (September 16–18, 2026)
Automatically translated from French ·
Published on Saturday, September 12, 2026 at 1:10 PM
From September 16 to 18, 2026, the Grand’Mare tunnel on RN28 will be closed at night for maintenance. Light vehicles and heavy goods vehicles will be diverted via specific routes, including a "wide mesh" detour for heavy goods vehicles to limit traffic in urban areas.
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.
- Direction Abbeville → Rouen: route S2, starting from the Chapitre interchange, via RD43, RD243A and RD43A.
Specific detours for heavy goods vehicles:
- Direction Rouen → Abbeville (S3): D418, N338, Flaubert bridge, A150, A151, A29 toward Amiens, then A28 toward Abbeville.
- Direction Abbeville → Rouen (S4): A28, A29 toward Le Havre, A151, A150, Flaubert bridge, then N338.
These detours are indicated by signage S1-S3 (direction Rouen → Abbeville) and S2-S4 (direction Abbeville → Rouen), as well as by variable message signs. The objective is to limit heavy goods vehicle traffic through the urban areas of Bihorel.
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