I do the same thing. I have never bought snow tires, but pay attention to how the car feels as I'm going down the road. If it feels like the cars moving out of my own control I'll slow down a bit till it feels right and continue on my way. (I'll pull over any time some douche feels the need to go faster than me, idc, I know my lil cars limits and honestly, have no money or ability to replace it should I crash.)