When controlling two-way traffic using flaggers, what conditions must be present?

The correct answer is characterized by the conditions in which a flagger is most effective in managing traffic safely and efficiently. When there is low volume and low speed, flaggers can effectively control the flow of vehicles with less risk of accidents or confusion among drivers. In low-volume scenarios, the number of vehicles is manageable, allowing flaggers to direct traffic with a clear line of sight and noticeable presence. Additionally, when vehicle speeds are low, drivers have more time to react to the flagger’s instructions, reducing the likelihood of misinterpretation or hazards occurring.

In contrast, higher volume or speed conditions increase the complexity of traffic management and may overwhelm flaggers. High-volume traffic can create significant congestion, and drivers may not consistently be able to see or heed flagging signals. Similarly, in high-speed situations, the reaction time for drivers diminishes, and the risks of accidents potentially increase. Therefore, the conditions of low volume and low speed provide the safest and most effective environment for flaggers to direct two-way traffic.