What type of flags or lights are permissible for temporary track conditions?

The correct choice emphasizes the importance of adhering to established system standards for flags and lights used in temporary track conditions. Maintaining safety on the railway requires that all signaling devices used in such scenarios meet specific criteria to ensure clarity and visibility for all personnel involved.

System standards are designed to provide uniformity and reliability, ensuring that the signals are recognizable and effective in conveying the necessary warnings or information. This minimizes the risk of accidents and helps maintain safe operations during any temporary disruptions or changes in track conditions.

Using flags or lights that are not aligned with these standards could lead to confusion or misinterpretation of signals by workers, thereby compromising overall safety. Thus, it is critical that any flags or lights used during temporary track conditions are compliant with the established guidelines set forth by the system to provide the necessary assurance for safety.