ALAMIN: Bakit kaya red, green, at yellow ang kulay ng traffic lights?

Madalas tayong makakita ng traffic lights kapag bumibiyahe sa mga kalsada. Pero bakit kaya pula, dilaw, at green ang kulay ng traffic lights? Subscribe to our official YouTube channel, https://bit.ly/2ImmXOi Be the first to know about the latest updates on local and global issues, news and current affairs, 911-UNTV Rescue and public services. We Serve the People. We Give Glory To God! #UNTV #UNTVNewsandRescue For updates, visit: https://www.untvweb.com/news/ Check out our official social media accounts: https://www.facebook.com/UNTVNewsRescue https://www.twitter.com/untvnewsrescue https://www.youtube.com/untvnewsandrescue https://www.tiktok.com/@untvnewsandrescue/ Instagram account - @untvnewsrescue Feel free to share but do not re-upload.