I stumbled across several comments from Altima owners who said that their car wanders all over the road, especially on the freeway. “It ain’t just me!” I thought since my car (2015) was new (1,800 miles) it was just the squirrely winter tires that I put on that was causing the drift. Having some alignment experience, I can figure out that the factory toe-in setting is just too conservative, so the setting needs to be more positive. I made a slight adjustment in my garage, and the problem is solved: no more drift on the freeway, even with the squirrely tires. (For those of you familiar with steering, I turned both of the inner tie rods ½ turn out, which makes the tie rod assembly longer. For those who don’t understand, see a wheel alignment specialist to make this adjustment.) The possible downside to this adjustment is increased outer shoulder wear on the front tires, so I will monitor tire wear closely for the next 1,000 miles to see if I have adjusted too much.