Build your very own traffic light set. Once built you can change the lights from auto to manual and watch as the red amber and green lights activate. Play with all your favourite cars trucks and train sets Learn how electric circuits control how the coloured lights change. Batteries required. Ages 5 and over. Build your very own traffic light set. Once built you can change the lights from auto to manual and watch as the red amber and green lights activate. Play with all your favourite cars trucks and train sets Learn how electric circuits control how the coloured lights change. Batteries required. Ages 5 and over.