adjustable studded tires

In many countries there is no steady snow season, so it is real necessity to have road adjustable stud winter tires.
Proposal

In the center of the wheel 1 there is a step motor 2 which rotate (push pull) the wire 3 (or thin bendable strap like in plastic window corner fittings). The wire has the shape which push the stud away when the road is icy.
The wire lay inside the rubber layer.