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.
Varying standards for minimum tread depth is something that continues to be confusing for those new to the industry. According to the Federal Motor Carrier Safety Administration (FMCSA), the minimum tread depth for truck tires is 4/32nds of an inch on the front axle and 2/32nds of an inch for all other wheel positions. Law enforcement officials often ticket drivers when the tread depths on their vehicles.