From Grenoble, head towards Bourg d’Oisans and Briançon; from Briançon, head towards Grenoble via the D1091 (formerly the N91). This road passes through the Col du Lautaret. Park in one of the many lay-bys dotted around the Col du Lautaret area. There is one at the junction of the Nationale 91 and the Route du Galibier.
Normally, when the first snow falls, a barrier closes this road to all vehicles.
(S/E) Leave the car park and go through the barrier. Follow the road as it winds its way uphill through numerous hairpin bends. As you climb and round the bends, new, spectacular landscapes unfold before your eyes.
(1) Ignore the paths to the right and left and carry on straight ahead, staying on the road.
(2) Pass the start of the footpath on your left – which you’ll take on the way down – and carry on along the road.
(3) After the monument dedicated to Henri Desgrange (founder of the Tour de France), you’ll reach the entrance to the tunnel.
If the gates are open, go through the tunnel (365 m long). The tunnel is unlit but runs in a straight line (you can see the other end); there are no obstacles or holes, and the road surface is in perfect condition.
If the gates are closed, take the road branching off to the right which climbs up to the Col du Galibier (the real one), provided it is passable. Otherwise, turn back.
(4) Assuming you can pass through the tunnel, you will arrive in Savoie on the Maurienne Valley side. Walk round the building on the promontory to admire the view, then return to the tunnel to pass through it in the opposite direction and begin the descent along the road.
(2) Just past an old building surrounded by protective fencing (dangerous ruins), take the path on the right (if passable) and follow it until it joins the road a little further down.
(1) Return to the road on the right, heading downhill, to reach the car park (S/E).