Winter tires are designed to prevent snow from accumulating in their grooves. Deeper grooves mean:
- Better traction in the snow
- Faster snow and slush clearance
- Reduced braking distances
- Safe acceleration
The grooves on your tires should not be less than 1.6 mm deep. During the winter, the recommended depth is at least 4.8 mm. To measure the depth, place a quarter in a groove with the caribou’s nose pointing down. If you can see the caribou’s snout, this means the tire will not grip well in deep snow. Check several grooves in different locations for tire wear.
See the following capsule from CAA-Québec: Comment mesurer l’usure des pneus de sa voiture?
(in French only).
Winter tires in good condition make it possible to:
- Reduce braking distance by 25%
- Maintain tire elasticity to -40°C
However, winter tires and their condition are no guarantee against accidents. Adjust your driving to weather and road conditions:
- Slow down
- Stay further away from other vehicles