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Information bulletin
Reconstruction work on the bridge structure on RN122
Automatically translated from French ·
Published on Saturday, September 12, 2026 at 3:54 PM
Reconstruction work on the Cère Bridge - Lastache on the RN122 will take place from 24 August to 23 October 2026, in three phases. Traffic will be alternating or closed depending on the periods. Detours are planned for users.
Rehabilitation works on the structure "Le Pont de la Cère - Lastache" on the RN122, as part of the national road network maintenance program.
Work period:
- From Monday 24 August to Friday 23 October 2026
- In three phases within the municipality of Saint-Jacques-des-Blats (15), over a distance of 0.5 km
- A second phase of works with alternating traffic is scheduled for spring 2027
Traffic conditions:
- Phase 1 (24 August – 6 September): alternating traffic
- Phase 2 (7 September – 20 September): closure of the RN122 between the Lioran tunnel and the Hôtel des Chazes
- Phase 3 (21 September – 23 October): alternating traffic for all vehicles
Detours implemented:
- Phases 1 and 3 (alternating traffic):
- Murat → Aurillac: detour via RD67 to avoid traffic buildup in the Lioran tunnel
- Murat → Aurillac: normal traffic through the Lioran tunnel
- Speed limited to 50 km/h throughout the affected area, overtaking prohibited
- Phase 2 (closure):
- Light vehicles: detour via RD926, RD721 (via Saint-Flour), RD921, RD990 (via Pierrefort), RD920
- Heavy vehicles and light vehicles: detour via RD3 (via Riom-Es-Montagnes), RD922 (via Mauriac), RD1120
In case of unforeseen site or weather-related incidents, work may be postponed.
The DIR Massif-Central thanks users for their understanding, asks them to respect signage, and to ensure the safety of site personnel.
Additional information on: www.dir-mc.fr and www.bison-fute.gouv.fr
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