No special access issues
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When driving N94 in the Durance Valley, aim for L'Argentière-la-Bessée.
Once near L'Argentière-la-Bessée, start following arrows for Vallouise (road D994E)
Keep driving up past Vallouise. The first sectors are reached before the village of Ailfroide.
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Approaches are generally ok. But remember you're in alpine terrain, so sometimes it might get tougher.
The sectors before and near the village of Ailfroide are family-friendly. At La Steppe, you can "park and climb" too.