When driving at 20 mph on packed snow, you should maintain a following distance of at least

Explanation

Under poor or hazardous driving conditions, you should increase your following distance. For example, when driving at 20 mph on packed snow, you should maintain a following distance of at least six seconds ? twice the usual following distance. At higher speeds, you should increase your following distance even more. At 40 mph on packed snow, you should maintain a following distance of at least twelve seconds. Don't even think about driving at 60 mph on packed snow unless you're driving a snowmobile.