Winter tires are important, but only if you have enough tread. Legally, you cannot have less than 3.5 mm (approximately 5/32 of an inch) on most highways in British Columbia between October 1 and March 31. If you barely have the legal minimum depth of tread, you should replace your tires for improved safety on the road.
What’s the big deal with tread, anyway? Well, the tread groove disperses water and snow as the tires roll, allowing the tires to make contact with the road. A shallow groove reduces the tires’ ability to push water and snow to the outside, which can cause hydroplaning and loss of traction.
If you’re looking for more information on winter tire requirements and recommendations, give this blog post a read.