Winter driving · equipment
Snow Chains in the Alps: When You Actually Need Them
Most winter Alpine driving never needs chains. The trips that do need them tend to need them badly, at the worst possible moment. Here is how to tell which trip you are on.
Last checked 24 August 2026. Rules and operating conditions can change; official sources are linked below and should be checked before travel.
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Add chains when you book, not at the counter.
Chains are usually a paid extra and are rarely in the boot by default. Reserve them early, then verify at pickup that the supplied set is approved for the country, permitted by the vehicle handbook and sized for the fitted tyres.
Quick answer
- ✓Chains are compulsory where a sign says so — not everywhere, and not all winter.
- ✓On Italian roads covered by a winter order and in French mountain zones, approved removable devices are an alternative to the qualifying winter-tyre option.
- ✓In Austria chains replace winter tyres only on roads that are more or less permanently snow-covered.
- ✓In Switzerland the round blue sign makes approved anti-skid equipment compulsory on that stretch; police may stop a non-compliant vehicle.
- ✓Fit them on the driven wheels, and practise once in the dry before you need them in the dark.
When you actually need chains
Chains have a reputation for being either essential or pointless, depending on who you ask. Both camps are describing different roads. The honest answer is that for the vast majority of a winter Alpine trip — motorways, valley roads, the run into most resort towns — compliant winter tyres are what you need and chains stay in the boot. They earn their place in three specific situations.
- A sign tells you to fit them. In Switzerland the round blue tyre-and-chain sign makes approved anti-skid equipment compulsory from that point, normally on at least two driven wheels on the same axle. Police may stop or turn back a non-compliant vehicle.
- You are on a road or in a zone where removable devices are the alternative to winter tyres. Italy uses road-specific orders, commonly from 15 November to 15 April. In signed French mountain zones from 1 November to 31 March, the choice is qualifying 3PMSF winter tyres on four wheels or approved removable devices for at least two driven wheels.
- You are climbing to a high resort after fresh snow. Resort access roads are cleared as a priority, but during and just after heavy snowfall the last few kilometres can be the one part of the journey where tyres alone are not enough.
Chains, socks or nothing: what counts
| Option | Where it is accepted | Honest assessment |
|---|---|---|
| Metal snow chains | Widely recognised when correct for the vehicle; always follow the sign and handbook | The most universally recognised carry option. It must fit the tyres and be permitted by the vehicle manufacturer; practise before the trip. |
| Textile snow socks | French law refers to approved removable devices, but current official safety guidance conflicts on socks; do not rely on them without current local confirmation | Easy to fit but quick to wear on bare tarmac. Approval, the road sign and the vehicle handbook all matter. |
| Winter tyres alone | Can satisfy the general tyre option when its markings and tread meet that country's rule | The normal setup for maintained roads, but it never overrides a chain or anti-skid-device sign. |
The mistake that costs a holiday morning
The most common chain failure is not the wrong chains — it is the first time being in the dark, in traffic, on a slope, in gloves. Take them out in your driveway or the hotel car park once, in daylight, and fit one. Ten minutes then saves an hour later, and it tells you immediately whether the set actually fits the car you were given.
Which wheels, and how they go on
Chains go on the driven wheels: the front pair on a front-wheel-drive car, the rear pair on rear-wheel drive. On four-wheel drive, check the handbook — the manufacturer specifies which axle. Where Swiss signage makes chains compulsory the requirement is that at least two wheels on the same driven axle carry them.
Practical points that matter more than the technique itself: stop somewhere flat and visible before the climb rather than halfway up it, keep the chains where you can reach them without unloading the boot in the snow, keep speed low once fitted, and take them off as soon as you are back on clear tarmac.
Renting versus buying
If you are flying in and hiring a car, add chains to the booking. They are usually a paid extra, are rarely in the car by default, and reserving them early gives the supplier a better chance to allocate a suitable set. Confirm they are actually in the boot before you leave the airport — and confirm they match the wheels on the car you were handed, not the car class you booked.
Buying makes sense if you drive to the Alps in your own car more than once a season. Chains are sized to the tyre, so buy for the exact size on the sidewall. If you are hiring, you cannot know that size in advance, which is the practical reason renting wins for most visitors.
Frequently asked questions
Are snow chains compulsory in the Alps?
Not everywhere and not all winter. A chain or anti-skid-device sign can make equipment compulsory on that stretch. Italian road orders and French mountain zones also allow approved removable devices as an alternative to qualifying winter tyres. In Austria chains replace winter tyres only on roads continuously or almost continuously covered by snow or ice.
Are snow socks as good as chains?
They are easier to fit and gentler on alloy wheels, but they wear quickly on bare tarmac and are not a universal substitute. French law refers to approved removable devices, while current French Interior Ministry safety guidance says not to rely on socks. If France is on your route, metal chains are the safer carry option unless current local guidance and the product approval clearly confirm otherwise.
Which wheels do snow chains go on?
The driven wheels: the front pair on a front-wheel-drive car and the rear pair on rear-wheel drive. On four-wheel-drive cars follow the manufacturer's handbook. Swiss rules require chains on at least two wheels of the same driven axle where the chains-compulsory sign applies.
Should I rent or buy snow chains?
Rent if you are flying in and hiring a car, because chains must match the exact tyre size on the car you are given, which you cannot know in advance. Add them to the booking rather than asking at the desk. Buy only if you drive your own car to the Alps regularly, and buy for the size printed on your tyre sidewall.
Can I drive on the motorway with chains fitted?
You should take them off as soon as the road is clear. Chains are designed for snow and ice, and running them on bare tarmac damages both the chains and the road surface while making the car unstable. Keep speeds low whenever they are fitted.
Official sources
Rules change. These are the authorities to re-check before you drive — we link them so you never have to trust us on a fine.
- ch.ch — the Swiss authorities' portal
- Austrian Ministry (BMIMI) — winter tyres and snow chains
- European Consumer Centre — winter tyres by country
- TCS — live Swiss road and pass status
- French Highway Code D314-8 — approved removable anti-skid devices
- French Interior Ministry — current winter mountain safety advice
- TCS — Swiss snow-chain rules and fitting guidance