In order to increase the amount of grip when the roads are icy or snow-covered winter tyres or snow chains are fitted. This is common practice in many countries where snow and ice is either long-lasting, or where altitude means heavy falls of snow are common-place. Every country has different rules, laws and regulations.
Driving with chains will reduce fuel efficiency and can limit the speed of the automobile to approximately 50 km/h (30 mph).
A road is always less predictable in winter than in hot weather; whether it's snowy, icy or just wet, the surface always gives less grip than in summer.
Because of the specific form of a winter tyre, which is designed to displace the water passing under the tyre, a winter tyre reduces the risk of aquaplaning, as well as improving grip in more extreme conditions. A winter tyre gives much better adherence and excellent traction, because it has a deeper tread than a summer tyre. A winter tyre
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