Snow Chains
You will see snow chains advertised in specialist media and
some people do carry them in the winter to get them out of
trouble - or perhaps further into trouble.
There are various types of what are referred to as snow chains.
Without going into details, the aim is to give extra grip
on ice and snow and allow the vehicle to maintain forward
movement. In the UK there is virtually no real need for snow
chains, and if you do use them you should be aware that you
must only use them on snow or ice covered roads - it is an
offence to use snow chains on tarmac - and anyway, they would
damage your tyres. So, given the UK norm there is either,
no real need for snow chains, or you would be in and out of
your car mounting and demounting them every couple of hundred
yards.
In Europe there are some roads, particularly in Austria and
Switzerland where you cannot drive without either four wheel
drive or snow chains in winter. There can also be extended
stretches of roadway throughout Europe with snow covering,
in which case it might be worthwhile using snow chains. However,
in most cases, winter tyres will do the job.
For advice on buying snow chains for use in snow, this is
what Michelin say "Make sure when you buy ones that are suitable
for the bodywork of your vehicle and the size of your tyres.
For preference, choose chains that have the maximum number
of elements (links) in the contact patch (a chain with a diamond
or straight pattern, having at least twelve bars for a medium
tyre). Once you have bought them, practise putting them on
and taking them off. It's always easier in daylight than during
night. And consider putting them in your boot in an easily
accessible place, together with a pair of gloves and a torch,
just in case."
If we step up a grade from cars there are some commercial
operations that make regular use of chains, sometimes to give
grip, sometimes to protect their tyres. These quarrying and
forestry operations use some heavy duty equipment that allows
them to work in extreme conditions. The quarrying operations
use a tight chain that protects against tyre penetration by
sharp objects, the forestry chains are more open and are there
to give grip in slippery soil, permafrost and can grab tree
roots and stumps and give vehicles with high floatation tyres
grip in slow moving low traction situations.
That latter option is one that is also available to the commercial
4x4 user operating in extreme circumstances. Chains on 4x4
vehicles can give added traction in the snow, but also in
deep mud and certain types of sand. However, they are not
really an acceptable option for the average farm track or
green lane.

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