The top left sign is a stop sign. It is red with a white border and the word "STOP" written in bright white in the center. The top right sign is a yield sign - yellow with a black triangle and the word "YIELD" written in black in the center. The bottom left sign is a speed limit sign. It's white with a black border, with the number "55" written in black in the center. The bottom right sign is a car maintenance sign. It's blue with a white outline of a car, and the words "CAR MAINTENANCE" written above it in white.
To give this coloring page an interesting look, you could color in the signs and their backgrounds in nice, bold colors. For the stop sign, make it a vibrant red and fill in the white border with a lighter shade. For the yield sign, fill in the yellow background with an even brighter hue and make the triangle a deep black. Give the speed limit sign a bright white background, keeping the border black, and color the number "55" a bright yellow. And finally, for the car maintenance sign, give the car itself a bright blue color with white details. You could also use a bright green background for the sign with white text.
This coloring page would be a great educational tool for kids to recognize and be able to recall traffic signs.