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This simple traffic signal concept where 2 manual battery operated lights – Red, Yellow, Green can be triggered on/off via simple 3 way switch. For more information... Website: www.scienceprojects4all.com YouTube Video on latest science projects: http://www.youtube.com/scienceprojects4all Facebook Page: https://www.facebook.com/scienceprojects Indiamart Page: http://www.indiamart.com/scienceprojectsindia/ For more information please feel to get in touch with us Website: www.scienceprojects4all.com Facebook Page: https://www.facebook.com/scienceprojects