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Question:

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

A six seconds.
Explaination

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.