If you've chosen category 1 or 3, your taxes are calculated at the Single rate. Category 2 is calculated at the Married rate. Here is how the marital status categories appear in the Tax Data section of your pay statement: What You Claim on Your W-4.
Remember, with winter tires only the first 50% of tread is really for use. After that, you have the equivalent of half-worn all-season tires. Blizzak special outer rubber differs from lower layer, too, as the maker informs. Winter tires with 11/32 new tread depth are effectively kaput at 6 or 5 / 32. You should not push regular tires below 4/32 in any case, see wet stopping distances at full, at 4 and at 2 /32 video comparisons on Tirerack.com.
In Canada, the minimum tread depth of 2/32 inch for cars/light trucks is a federal standard, enforced by local police under the authority of the Motor Vehicle Safety Act, according to information from the Rubber Association of Canada.