We love this book! It's only photos of different signs but, my 3-year-old is excited to read it (over and over and over!). It has even prompted her to start reading/inquiring more signs when we're out and about. My only qualm is the "No Smoking" sign but, I guess it's good discussion for what it means and what an unhealthy habit it is! :D
This book is really outdated! (My own fault for not checking the copyright date.) It's fun to look at some of the old signs, but my 4-year-old does not recognize most of them.