At what distance should a motorist be able to see ahead on curved roads for safety?

The correct answer emphasizes the importance of being able to see far enough ahead on curved roads to ensure safety. Being able to see an adequate distance ahead allows drivers to anticipate obstacles, make informed decisions on adjusting speed, and navigate the curve safely. The recommendation to be able to visualize 10 seconds worth of travel distance provides a more comprehensive safety measure compared to fixed distances in feet, as it accounts for varying speeds and conditions that a driver may encounter. This approach helps ensure that drivers maintain a safe following distance and have sufficient reaction time when facing unexpected situations on the road, making it a crucial guideline for safe driving in turns and curves.

The other options focus on specific distances, which may not adequately address different driving scenarios. For instance, the distances given in feet might be insufficient depending on the speed of travel or the road conditions, as they do not provide the flexibility that the time-based measurement offers.