Final answer:
A yellow flasher light means drivers should slow down and proceed with caution, as it indicates a need to be vigilant of potential intersecting traffic and enhances overall road safety.
Step-by-step explanation:
A yellow flasher light means slow down. Be extra careful of intersecting traffic. Proceed with caution. For instance, if a traffic signal was installed at an intersection where many vehicles speed through without regard to the posted speed limit, vehicles would have to slow down, thus improving traffic safety.
Pedestrian safety is also enhanced because a signal allows them to cross at more appropriate times. Traffic signals play a significant role in controlling the flow of traffic and ensuring the safety of pedestrians, especially in areas with heavy traffic and significant pedestrian activity.