What is the minimum height for traffic cones used on low-speed roadways during daytime?

The minimum height for traffic cones used on low-speed roadways during daytime is indeed 18 inches. This standard is established to ensure visibility and effectiveness in guiding motorists during traffic incidents or construction activities. An 18-inch height strikes a balance between being noticeable to drivers while still being manageable for placement and removal by personnel.

Using cones of this height is important for safety; they are tall enough to be seen from a distance, which helps in alerting drivers to potential hazards or directions for detours. At the same time, they should not be excessively tall, which could create confusion or block sight lines. Therefore, the 18-inch specification is particularly relevant in low-speed environments, where drivers are better able to react to the presence of such cones. Ensuring visibility in these scenarios is crucial, as low-speed roadways often experience a higher volume of pedestrian traffic or nearby activities.