They make a difference sure, but IMO not enough to reduce the amount of collisions we see every winter. Ever since I've had mine I notice maybe an extra 20% grip when I need it. Definitely not the super improvement I was expecting. More then anything, I find they give me confidence to drive on those slippery roads (to Sunshine, etc).
It's still driver error that leads to most collisions. Has there been a study somewhere in one of the provinces that makes it mandatory that actually shows it reduces collisions? I've never seen one, but I'd be on board if there was proof it works.
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