In British Columbia, winter tires are required on high mountain passes between Oct. 1 to March 31 throughout the province. They are also required on designated highways.
While winter tires are required on all mountain passes between Oct. 1 to March 31, they are only required on some highways. These highways are generally those that approach high mountain passes, as well as those interior highways where conditions can change from rain to snow very quickly. Signs are posted on each of the designated highways to advise motorists where winter tires are required.
Winter tires are those carrying either the winter mountain or snowflake symbol or the mud and snow designation, M + S. The former provide the best level of traction and safety in severe snow and ice conditions. Winter tires must be in good condition with a minimum tread depth of 3 to 4 millimeters.