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Deleted User
Snow chains are intended as a temporary measure to ensure the vehicle continues to progress when roads are covered with snow or ice. They are not mandatory on a country-wide basis, but you must carry and fit chains when conditions demand. The police can stop you and forbid you from travelling further if you do not have chains and fit them when required. Many countries have road signs indicating roadside bays where you should stop and fit snow chains. If snowchains are fitted you should travel at no more than 30 mph and should remove them as soon as possible to avoid damaging the road service. Snow chains should always be fitted to the driving wheels, and to the front wheels of 4x4s.
"not mandatory on a country wide basis" you seem to have forgotten to highlight that!