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.
Front tires should have 4/32-inch tread depth, and all other tires 2/32-inch tread depth. Name some things you should check on the front of you vehicle during the walk around inspection. Lights (low and high beam), four-way flashers, parking, clearance, side-marker, and identification lights.