If you aren't sure when your tire pressure was last checked, do it now (or the next time it's not actively precipitating).
Otherwise you may, like me, check your tires and go from "oh, hey, I bet that's why I've been getting such lousy mileage this winter" to "wow, I am lucky I haven't had an accident on these things." (With a side of "I guess my dealership checks wear but not pressure, go figure.").
And now, six million eight thousand and two things to do before I can be online again, probably late tonight.