Originally Posted by paulrio74
Roads with mandatory chain controls require a tire with the snowflake symbol instead of m+s in many states.
Just a little FYI, since I see you are in Oregon also. In oregon M+S tires and AWD/4WD constitutes having a traction device. The only time you need more, is during a conditional closure, which doesn't happen often, and then you need chains AND AWD/4WD, snowflake tires alone won't be legal..