A legal winter tire is defined as having at least 3.5 mm of tread depth plus the letters M and S or a three-peak mountain/snowflake symbol.
Environment Canada forecasts heavy snow for parts of Trans-Canada Highway
![](https://hitnews.info/wp-content/uploads/2024/04/environment-canada-forecasts-heavy-snow-for-parts-of-trans-canada-highway.jpg)
A legal winter tire is defined as having at least 3.5 mm of tread depth plus the letters M and S or a three-peak mountain/snowflake symbol.