A high level warning device must consist of a minimum number of flags and maintain a specified height. How many flags are required?

A high-level warning device is essential for alerting drivers to the presence of a temporary traffic control zone, especially when visibility may be compromised. The requirement for a minimum number of flags ensures that the warning device is adequately visible from a distance and maintains a consistent standard for safety.

Using two flags as the minimum requirement allows for better visibility and enhances the recognizability of the warning system. This arrangement helps to capture the attention of approaching drivers more effectively than having just one flag, which might not provide sufficient warning or draw attention to the work zone adequately.

In terms of placement, having two flags can also improve the device's stability and make it less susceptible to being overlooked. The specifications regarding the height of the flags ensure that they are positioned optimally for visibility across various environments and conditions, making the use of two flags a standard practice in traffic control to achieve the desired level of safety and communication with drivers.