Final answer:
When driving, it is important to scan the road ahead for potential dangers. It is recommended to scan at least 12 to 15 seconds ahead.
Step-by-step explanation:
When driving, it is important to scan the road ahead for potential dangers to ensure safe and defensive driving. The farther ahead you scan, the more time you have to react and take necessary actions. As a general guideline, it is recommended to scan at least 12 to 15 seconds ahead, which is equivalent to about a quarter to a third of a mile if you are driving at a speed of 60 mph.