Red means Stop
My one-and-a-half-year old was having difficulty with the concept of 'stop' so now we play a game where we say, 'run and run and run and stop' while we are out, in order to practice. You can also try walk and stop, slide and stop, tiptoe and stop. They learn new vocabulary for movement and also practice the word and concept of stop. She now understands what it means, and she likes to be the one in charge of the game.