Last year, CSDD decided to ban vehicles with dangerous - summer tires or over-worn winter tires - from using the road by having their roadworthiness certificate and license plates removed.
Winter tires are compulsory from December 1 until March 1 for the winter season and require at least 4 millimeters of tread. The CSDD also advises drivers not to continue to use tires after 5-6 years and to ensure they are running with the correct air pressure. It is also necessary to modify one's driving style in winter conditions, particularly with regard to braking distances.
More information (in Latvian) about the legal requirements is available at the CSDD's information on winter tires section of its website.