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Traffic rules
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Official Transport Canada winter-driving guidance covering visibility, speed adaptation, braking and winter-tire use.
Driving safely in winter | Transport Canada
Official winter-tyre, studded-tyre and tread-depth requirements.
Winter tyres | Transportstyrelsen
Official tread-depth, winter-tyre, studded-tyre and chain rules.
Tyre requirements | Statens vegvesen
Official winter-tyre requirements for light and heavy vehicles.
Compulsory use of winter tyres
For additional context, this Wikipedia article examines Snow tire, describing how it works, how it is designed and its practical role in vehicles or road traffic.
Snow tire - Wikipedia