Going 30 miles per hour on ice where should you stop before the light?

If your on "ice" and your driving 30 MPH you are going kinda fast unless you have chains or studs, best thing is to test your grip without other vehicles near by,

The law does not make concessions for weather: if there's a red light in front of you, you are still expected to stop for it normally ie at the stop line or before the sidewalk.