Tire Tips
As a tire wears, snow traction is reduced: Tires that are worn close to the read-wear indicators have reduced traction and should not be used on snow-covered roads or in severe snow conditions.
Some provinces still allow studded tires during selected months and they work well provided the tires are in good shape but they are noisy and hard on pavement. In fact, winter tires with many sipes outperform studded tires.