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RN57 - Securing of cliffs at La Cluse-et-Mijoux (25)
Automatically translated from French ·
Published on Saturday, September 12, 2026 at 4:38 PM
From April 13 to July 24, 2026, the RN57 will be closed in the direction Switzerland → France between the Hôpitaux bypass and the Château de Joux hostel. Categorical diversions will be implemented for heavy vehicles. The works aim to secure the cliffs and replace a water pipe dating from 1900.
Emergency instructions
Categorical diversions:
- Light vehicles: Oye-et-Pallet.
- Heavy vehicles < 3.9 m: Oye-et-Pallet.
- Heavy vehicles > 3.9 m: Frasne.
Closures:
- Swiss → France direction: from 13 April to 24 July 2026.
- Two-way direction: from 19:00 to 05:00, from 31 August to 11 September 2026.
Emergency numbers: None provided in the source.
Work on securing the cliffs along the RN57 in the Combe de Joux area (25) will take place from Monday, 13 April to Friday, 24 July 2026.
Objectives of the works:
- Protection against rockfalls upstream of the road.
- Replacement of a drinking water pipeline dating from 1900, located beneath the RN57.
- Road surface reconstruction and maintenance of road equipment.
Funding:
- Total amount: 1.6 million euros.
- 1.1 million euros for cliff security, funded by the State.
- 0.5 million euros for road surface and maintenance works.
Work schedule:
Phase 1 (16 March – 10 April 2026):
- Replacement of the drinking water pipeline at the sawmill parking area and the Fourgs crossroads.
- Traffic maintained in both directions, with reduced lanes and speed restrictions.
Phase 2 (April 13 – July 24, 2026):
- Closure of RN57 in the Switzerland → France direction between the Hospital diversion and the Château de Joux hostel.
- Traffic maintained in the France → Switzerland direction.
- Categorized diversions implemented:
- Light vehicles: via Oye-et-Pallet.
- Heavy vehicles < 3.9 m in height: via Oye-et-Pallet.
- Heavy vehicles > 3.9 m in height: via Frasne.
- Safety works on cliffs (620 m of rockfall protection nets) and renewal of the water pipeline by SIEJ and CCGP.
Phase 3 (August 31 – September 11, 2026):
- Closure of RN57 only at night (7 p.m. to 5 a.m.), in both directions.
- Categorical diversions implemented in both directions:
- Light vehicles and heavy vehicles < 3.9 m: via Oye-et-Pallet.
- Heavy vehicles > 3.9 m: via Frasne.
- Road surface rehabilitation works carried out by DIR Est.
Specific measures:
- Fixed signage in place since the diversion at Hôpitaux.
- Height restriction markers on RD437 to limit access for overly tall heavy vehicles.
- Dynamic signage with height detection on RD437 upstream of the Rosiers intersection.
Access to Château de Joux:
- No impact on traffic.
- Access possible via usual routes, following diversions if necessary.
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RN57 - Securing of cliffs at La Cluse-et-Mijoux (25)
From April 13 to July 24, 2026, the RN57 will be closed in the direction Switzerland → France between the Hôpitaux bypass and the Château de Joux hostel. Categorical diversions will be implemented for heavy vehicles. The works aim to secure the cliffs and replace a water pipe dating from 1900.