Why are traffic cones designed to have a minimum height of 18 inches?

The design of traffic cones with a minimum height of 18 inches significantly enhances their visibility, which is crucial for safety in work zones and areas with traffic. The larger size ensures that they can be easily seen by drivers from a distance, especially under various light conditions, including low light or adverse weather situations. This heightened visibility aids in alerting motorists about potential hazards or changes in traffic patterns, thereby reducing the likelihood of accidents.

The other factors related to cone design, such as stability and stacking, may play a role in their overall effectiveness and usability, but the primary purpose of height in this context is to ensure that drivers notice them promptly, which is paramount for maintaining safety standards in construction and work zones.