What is the issue with calculating Following Distance based on vehicle length?

Calculating Following Distance based on vehicle length is fundamentally problematic because it primarily depends on personal perception instead of a standardized time measurement. Following distance is critical for safe driving, and it is typically recommended that drivers maintain a distance that is measured in time, such as the two-second rule, which allows for a reaction time to unexpected events.

When relying solely on vehicle length for determining following distance, different drivers may perceive that length differently, leading to ambiguous assessments of safety. Personal perception can vary significantly based on factors such as visibility, road conditions, and even driver experience, causing inconsistencies that could lead to dangerous driving situations. In contrast, a time-based measurement is more objective and universally applicable, accounting for various conditions and response times, thereby promoting safer driving practices.

While the other options hint at different concerns that could affect driving safety, they do not directly address the specific issue of relying on vehicle length alone as a measure of following distance.