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Information bulletin
Works on RN12 between Ploumagoar and Plouisy (22)
Automatically translated from French ·
Published on Saturday, September 12, 2026 at 4:30 PM
The Interdepartmental Road Directorate (DIR) Ouest launches renovation works on the RN12 between Ploumagoar and Plouisy from 24 August to 10 November 2026. Traffic reversals will be implemented, with slip road closures and expected slowdowns during peak hours. Check diro.fr or bison-fute.gouv.fr to monitor traffic conditions.
Renovation works on the RN12 between Ploumagoar and Plouisy, in Côtes-d'Armor (22), will be carried out by the Ouest interdepartmental road department (DIR) from Monday 24 August to Tuesday 10 November 2026.
The operation, which crosses the municipalities of Ploumagoar, Guingamp, Grâces, and Plouisy, aims to permanently improve safety, driving comfort, and traffic flow.
The works will be carried out in several phases:
- From 24 August to 18 September: traffic heading toward Brest will be diverted to the opposite carriageway, over approximately 6 kilometers.
- From 21 September to 9 October: traffic heading toward Rennes will be diverted to the opposite carriageway, over approximately 3.5 kilometers between Kernilien and the Grâces industrial zone, with the ramps located on this section closed.
- From 12 October to 4 November: Traffic heading toward Rennes will be redirected to the opposite carriageway, over approximately 4 kilometers between the Grâces industrial zone and La Chesnaye, with closure of the affected slip roads.
- From 5 to 10 November: The left-hand lane will be closed in the direction from Saint-Brieuc to Brest to complete the work.
Alternative routes will be provided for motorists affected by the closure of access or exit slip roads.
Traffic will be maintained throughout the work period through lane reversals, but significant delays are expected, particularly during morning and evening peak hours.
Drivers are asked to respect temporary signage, speed limits, and safe distances. Extra caution is recommended when approaching the work site.
DIR officers are present every day to ensure user safety. Respect their work and their presence on site.
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