When operating a passenger coach in winter on hard-packed snow or icy mountain passes, what is the proper protocol regarding anti-skid tire chains (防滑链)?

1. Install certified anti-skid chains on the driving wheels (驱动轮) prior to encountering icy sections, drive at reduced speeds, and maintain extended following distances
2. Install anti-skid chains only on the non-driven front steering wheels
3. Drive at 80 km/h with chains on dry pavement to break up road ice ahead
4. Inflate tires to maximum pressure and avoid using any chains