Whilst travelling in Austria between 1 November and 15 April and if roads are covered with ice or snow, it is a legal requirement to use snow tires. All tires should have a minimum tread depth of 4mm.
You should carry snow chains when travelling in Austria. Road signs across Austria indicate when snow chains are compulsory. Snow chains on the driving wheels will only be allowed as an alternative to snow tires where the road is fully covered by snow and/or ice and the road surface will not be damaged by the snow chains. Failure to comply with the legislation can result in fines or the temporary loss of your vehicle.