As the first snows of winter arrive, many of the world’s most marvellous mountain roads are closed until the thaw. However, these five perfect passes in the Swiss Alps remain open all hours and ready for an Alpine adventure.

As you hustle through the hairpins of the Julier Pass, spare a thought for the snowplough drivers who have to manhandle their machines from switchback to switchback to keep the road open 365 days a year.