Final answer:
When driving on the highway, it is recommended to scan approximately 15 seconds ahead. This allows you to anticipate hazards and make safe driving decisions.
Step-by-step explanation:
When driving on the highway, it is recommended to scan approximately 15 seconds ahead. This means looking ahead at least 15 seconds into the future to anticipate any potential hazards or changes in traffic. By scanning ahead, you can ensure you have enough time to react and make safe driving decisions.
For example, if you are driving at a constant speed of 60 miles per hour, scanning 15 seconds ahead would be equivalent to scanning approximately 1/4 mile ahead. This allows you to identify any upcoming exits, merges, or other potential situations that may require you to adjust your driving.
Scanning ahead is an important part of defensive driving, as it helps you maintain situational awareness and be prepared for any unexpected events on the road.