Scenic Road Trip
Route des Grandes Alpes
17 Passes from Lake Geneva to the Med
From the shores of Lac Leman to the palm trees of Menton, the 720-km Route des Grandes Alpes crosses the entire French Alps via 17 passes. The Col de l’Iseran reaches 2,770 m, the Col de la Bonette loops to 2,802 m, and the final descent to the Cote d’Azur feels like arriving in a different climate zone — because it is.
Quick Facts
| Route | Thonon-les-Bains (Lake Geneva) to Menton (Mediterranean) |
| Country | France |
| Distance | 720 km |
| Recommended days | 5 |
| Total drive time | ~18 hours |
| Best months | July–September |
| Toll cost | None — the entire route uses free mountain roads (no autoroute) |
| Est. fuel cost | ~EUR 90 |
| Motorway speed limit | 130 km/h |
| Alcohol limit (BAC) | 0.05 |
| Drives on | Right |
Top 5 Highlights
1. Col de l’Iseran
The highest paved pass in the Alps at 2,770 m — thin air, big views
2. Col du Galibier
2,642 m Tour de France legend with a panorama of the Ecrins and Mont Blanc
3. Col de la Bonette
A loop road that climbs to 2,802 m — the highest paved road in Europe
4. Gorges du Cians
A narrow red-rock canyon with a road carved through it, near Nice
5. Lac d’Annecy
Crystal-clear Alpine lake framed by mountains — the first major stop heading south
Road Conditions & Terrain
Terrain: Continuous Alpine mountain passes crossing the French Alps from north to south
Road type: Two-lane mountain roads (D and N roads) with steep gradients, hairpins, and occasional single-lane tunnels
Best Time to Drive
Best months: July–September
The Col de l’Iseran and Galibier open mid-June at the earliest; late September sees autumn colours
Key Driving Rules
France requires warning triangle, reflective vest, and breathalyser. Speed limit 50 km/h in towns, 80 km/h on D-roads. Crit’Air vignette needed for Nice LEZ near the southern end. Mountain roads have 6–12% gradients — use low gear on descents to save brakes.
Speed Limits
| Road Type | Limit |
|---|---|
| Urban | 50 km/h |
| Rural/Open road | 80 km/h |
| Motorway | 130 km/h |
Required Equipment
- Warning triangle
- Reflective vest
- First aid kit
- Fire extinguisher
Estimated Costs
| Item | Cost |
|---|---|
| Fuel (petrol, round trip) | ~EUR 90 |
| Tolls/vignette | None — the entire route uses free mountain roads (no autoroute) |
| Petrol price (per litre) | ~$1.98 USD |
| Diesel price (per litre) | ~$1.82 USD |
Practical Tips
- Check all 17 pass statuses at inforoute.cg05.fr before departure — one closure requires a long detour
- Carry warm layers for the high passes — temperatures can drop below 5C even in July at 2,700 m
- This is prime Tour de France territory — expect cyclists on every climb, especially the Galibier
- Fill up in every town — fuel stations are scarce between mountain valleys
- The route can be reversed (south to north) for a dramatic finish at Lac d’Annecy
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Frequently Asked Questions
The Route des Grandes Alpes covers 720 km and takes approximately 18 hours of pure driving time. We recommend 5 days to enjoy the highlights and stops along the way.
The best months are July–September. The Col de l'Iseran and Galibier open mid-June at the earliest; late September sees autumn colours
None — the entire route uses free mountain roads (no autoroute)
France drives on the right side of the road.
The blood alcohol limit in France is 0.05 BAC.
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