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Work resumes for three months, from this Monday, March 20, on the RN12, in Saint-Brieuc – Brittany

After a first major project in 2022 on the RN12, near Saint-Brieuc, the interdepartmental direction of Western roads (Diro) announces a new phase of work of 12 weeks, starting this Monday, March 20, 2023.

It is still the Gouët viaduct which concentrates the attention of the State services, since it is necessary to renovate the watertightness of the work, but also “to renew the surface layers with a soundproofing coating, the safety devices as well as the structural joints between the Corneille interchange, in Saint-Brieuc, and the Rampes interchange, in Plérin”, specifies the Diro. The roadway, upstream and downstream of the engineering structure, in the direction of Rennes Brest, will also be redone.

No traffic in the Rennes Brest direction

The project is spread over three major phases. First, from March 20 to May 17, with night work. The lanes towards Brest will be completely closed to traffic, from 8 p.m. to 5:45 a.m. the next morning, from Monday evening to Friday morning. A diversion is in place from the Chaptal interchange (until April 7) or the Perray interchange (from April 11 to May 17) and will end at the Airport interchange, in Trémuson.

All the straps on the portions concerned will also be closed.

Works RN 12 Saint-Brieuc
A previous project, in the fall of 2022, had enabled the installation of a grid system to prevent desperate acts. (The Telegram/Laurent Marc)

Cycle path and reduced lanes

Second phase of work from May 4, and until May 17. “During this period, in addition to the night work, preparatory work will be carried out on the right-of-way of the cycle path on the Gouët viaduct. In theory, only the cycle path is concerned. In practice, they will lead to a reduction in lanes for cars, a speed limit of 70 km/h and the closure of the Rohannec’h entrance ramp, day and night from Tuesday 9 May.

Bridge closed sea side

Finally, from Monday May 22 to Sunday June 11, weekends included, the bridge will be completely closed on the sea side. Traffic in the Saint-Brieuc – Plérin direction will be in the opposite direction for 2 km, and on a single lane. The Diro therefore provides for significant slowdowns when approaching the viaducts. The slip roads at the Rohannec’h and Ginglin interchanges will be closed throughout this period.

A quadra to maintain

The Gouët viaduct is 40 years old, and in 2022 the Diro began a major maintenance program for a building that is as old as it is crucial, in terms of traffic in northern Brittany. The RN12 is, in fact, one of the busiest roads, recording the passage of more than 70,000 vehicles every day.

letelegramme Fr Trans

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