Final answer:
The correct color for warning signs related to pedestrians, bicycles, playgrounds, schools, and school buses is Yellow-Green, which is chosen for its high visibility.
Step-by-step explanation:
The color specific for warning signs that are related to pedestrians, bicycles, playgrounds, schools, and school buses is Yellow-Green. This color is highly visible and therefore is effective in alerting drivers to be cautious in areas where pedestrians and cyclists are likely to be present. Yellow-green is frequently used for safety purposes due to its high visibility in various light conditions, which enhances pedestrian safety, especially around schools and playgrounds where children are present.