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Most notably, the use of winter tires is mandatory from November 1st to April 15th on snow- or ice-covered roads, and carrying snow chains is required in certain mountain areas during winter. To reduce emissions, many cities, including Vienna, Salzburg, and Innsbruck, have established Low Emission Zones (Umweltzonen) , which require vehicles to display an environmental badge ( Pickerl ) indicating their emissions class; non-compliant vehicles may be denied entry.