Which type of beacon is NOT mentioned to be visible at night from 3,000 feet?

The answer indicates that Type B beacons are not specified as being visible at night from a distance of 3,000 feet, which underscores an important aspect of work zone safety regarding visibility. In the context of work zones, beacons are essential for alerting both workers and drivers to potential hazards. Different types of beacons have varied specifications and characteristics, particularly in terms of their visibility under low-light conditions, which is critical for nighttime safety.

Beacons, such as Type A, Type C, and Type D, are designed to ensure that they can be seen from significant distances even in darkness, thereby enhancing safety in work zones by providing clear visual warnings about road conditions or construction activities. Each beacon type may have specific brightness levels and light configurations that meet the requisite standards for nighttime visibility.

When considering the designations, it is crucial to recognize that not all beacons possess the same level of efficacy in terms of visibility, especially in critical safety situations. Hence, the fact that Type B is not mentioned as visible at night from 3,000 feet suggests a potential limitation in its effectiveness for nighttime use in work zones, reinforcing the importance of selecting the right type of beacon to maintain safety standards.