The distance that you should look ahead of your vehicle while driving is about _______ at highway speed.

How far Ahead to Look. Most good drivers look at least 12 to 15 seconds ahead. That means looking ahead of the distance you will travel in 12 to 15 seconds. At lower speeds, that is about one block. At highway speeds, it is about a quarter of a mile. If you are not looking that far ahead, you may have to stop too quickly or make quick lane changes. Looking 12 to 15 seconds ahead does not mean not paying attention to things that are closer. Good drivers shift their attention back and forth, near and far. Figure 2.6 illustrates how far to look ahead.
[Commercial Driver's License Manual]