Red light--stop! Green light--go! Our Interactive Traffic Signs are great for an indoor or outdoor setting to set up a bike track and talk about safety - when to stop and go. The railroad sign is a great visual for children along with the red, yellow, green light. It helps children learn to control their gross motor skills (motor planning) paired with visual processing. When you see red, you have to stop your bike or your body. When the arm goes down on the railroad sign, you have to stop.