What is the minimum distance from the curb where warning signs and channelizing devices may be omitted?

The correct answer indicates that warning signs and channelizing devices may be omitted at a minimum distance of 15 feet from the curb. This distance is established based on safety protocols designed to ensure that traffic has adequate warning about changes in road conditions or traffic patterns.

The purpose of having a minimum distance is to strike a balance between providing necessary warnings for drivers and reducing redundancy in traffic control measures, which could lead to confusion or distraction. By specifying a distance, it allows flaggers and workers to manage the work zone more effectively. Understanding this distance is crucial for ensuring safety for both flaggers and motorists while maintaining an organized traffic flow around the work site.

In this context, the specific distances mentioned by the other choices either fall short or exceed the established guidelines, making them less applicable. Therefore, the identified distance of 15 feet aligns well with industry standards for traffic control in work zones.