Siaix tunnel night closures return on 2 November
The RN90 works period runs from 2 to 6 November, with closures from 9pm to 5am. The Notre-Dame-du-Pré diversion is for light vehicles only.
The Siaix tunnel on the RN90 is scheduled to close overnight during the 2–6 November 2026 works period, from 9pm to 5am. This affects the Tarentaise approach between Moûtiers and Aime, used for journeys to Val d’Isère.
The diversion via Notre-Dame-du-Pré is for light vehicles only. If you are travelling by coach or another larger vehicle, arrange your timing with the operator rather than assuming the diversion is available.