This is a fun and creative coloring page! The vibrant yellow and black colors immediately draw the eye. The triangular shape of the road sign adds an interesting texture to the page, and the message - “Ejection of gravel. Traffic rules.” - is both intriguing and important. When coloring this page, you should use the yellow hue to fill in the whole sign. Then, you should use a bold black to outline the edges of the sign, as well as to highlight the lettering to ensure it is legible. Additionally, consider adding a hint of color to the sign itself by adding a vibrant red or green border. This will add a touch of creativity and color to the page and create an eye-catching piece of art.