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Question:

When you are driving at freeway speeds, you should look ahead at least

A 20-30 seconds.
Explaination

In ordinary driving, you should look ahead at least 12 seconds. When you are driving at freeway speeds, you should look ahead at least 20 to 30 seconds. This will allow you to watch traffic patterns and react to changes. (At 70 mph, your vehicle will travel 3,080 feet in 30 seconds more than half a mile.)