When driving on icy or hard-packed snow roads, what safety adjustments should be made to speed and following distance?

1. Maintain normal dry-road speed and reduce following distance to prevent other cars from cutting in
2. Significantly reduce traveling speed, increase following distance to 3 to 4 times the normal dry-road distance, and avoid abrupt steering or sudden braking
3. Drive on the extreme road shoulder to find gravel for traction
4. Pump the accelerator rapidly to maintain forward momentum