What is the purpose of a flashing roadway signal when it is above a warning or regulatory sign?

A flashing roadway signal above a warning or regulatory sign serves primarily to get a driver's attention. The flashing light acts as a visual cue that something important needs to be recognized or acknowledged, ensuring that drivers are aware of changing or critical conditions ahead. This could include hazards, mandates, or important notifications about the road or traffic situation.

The use of flashing signals is particularly effective in enhancing visibility and alertness for drivers, which may be crucial in high-traffic areas or locations with frequent changes in driving regulations. By drawing attention to nearby signs, the flashing signal helps promote safety and compliance with traffic laws.