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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 3:39 PM
From September 7 to 11 and September 16 to 18, 2026, the Grand'Mare tunnel on RN28 will be closed at night for maintenance. Diversions are in place, including a "large loop" for heavy goods vehicles, to limit traffic in Bihorel.
Electrical maintenance works, dynamic signage installation, communication network maintenance, and quarterly maintenance of the Grand’Mare tunnel on the RN28 will be carried out by the interdepartmental road authority Nord-Ouest (DIRNO) in two phases.
First period: from Monday 7 to Friday 11 September 2026
- Night closures of the tunnel from 20:30 to 06:00.
- Night from Monday 7 to Tuesday 8 September: closure in the Rouen → Abbeville direction (upstream tube).
- Nights from Tuesday 8 to Thursday 10 September: closure in both directions.
- Night from Thursday 10 to Friday 11 September: closure in the Abbeville → Rouen direction (downstream tube).
Second period: from Wednesday 16 to Friday 18 September 2026
- Night closures of the tunnel from 20:30 to 06:00.
- Night from Wednesday 16 to Thursday 17 September: closure in the Rouen → Abbeville direction (upstream tube).
- Night from Thursday 17 to Friday 18 September: closure in the Abbeville → Rouen direction (downstream tube).
Detours for light vehicles:
- Rouen → Abbeville direction: route S1 via the Grieu interchange, then RD43A, RD243A, RD43.
- Abbeville → Rouen direction: route S2 from the Chapitre interchange, via RD43, RD243A, RD43A.
Mandatory detours for heavy goods vehicles (« grande maille »):
- Rouen → Abbeville (S3): D418, N338, Flaubert bridge, A150, A151, A29 toward Amiens, then A28 toward Abbeville.
- Sens Abbeville → Rouen (S4) : A28, A29 toward Le Havre, A151, A150, Flaubert Bridge, then N338.
This measure aims to limit heavy goods vehicle transit through the urban area of Bihorel and to prevent transit traffic from crossing the center of Bihorel. Routes are marked by S1-S3 signage (direction Rouen → Abbeville) and S2-S4 signage (direction Abbeville → Rouen), as well as by variable message signs.
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