Final answer:
A flashing yellow light warns drivers to proceed with caution and is used at dangerous intersections to enhance safety by reducing accidents and protecting pedestrians, especially in areas with high traffic and speeding issues.
Step-by-step explanation:
A flashing yellow light serves as a warning to drivers to proceed with caution and is often used at dangerous intersections. These traffic signals play a critical role in traffic safety, signaling to drivers that they should slow down and be aware of potential hazards, including the presence of other vehicles, pedestrians and changing road conditions. The installation of traffic signals can significantly reduce the incidence of accidents, such as those that have occurred three times a month at a problematic intersection, where speeding and pedestrian safety have been major concerns, and an accident once led to a loss of life.