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The Traffic Light

The Traffic Light. Social Studies 9 Ms. Rebecca 2009. What is a traffic light?. http :// en . wikipedia . org / wiki / Traffic_light. What does a traffic light do?. Organizes traffic. http :// www . carplus . org . uk / resp - car - use / rcu - images / traffic%20jam%20web . jpg.

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The Traffic Light

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  1. The Traffic Light Social Studies 9 Ms. Rebecca 2009

  2. What is a traffic light? http://en.wikipedia.org/wiki/Traffic_light

  3. What does a traffic light do? • Organizes traffic http://www.carplus.org.uk/resp-car-use/rcu-images/traffic%20jam%20web.jpg http://images.google.co.th/imgres?imgurl=http://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Street_intersection_diagram.svg/531px-Street_intersection_diagram.svg.png&imgrefurl=http://commons.wikimedia.org/wiki/File:Street_intersection_diagram.svg&usg=__9Xw0NMY9TkYbv4V96tbBw3Ds1c8=&h=381&w=531&sz=15&hl=en&start=6&tbnid=AduAVP2SylO3TM:&tbnh=95&tbnw=132&prev=/images%3Fq%3Dintersection%26gbv%3D2%26hl%3Den

  4. What does a traffic light do? • Helps to prevent accidents http://images.google.co.th/images?gbv=2&hl=en&sa=1&q=accident+at+intersection&aq=f&oq=&start=0 http://www.freefoto.com/images/1216/05/1216_05_54---Stop-Sign--Beatty--Nevada--USA_web.jpg

  5. How does it work? • A traffic light is set up at an intersection. http://farm4.static.flickr.com/3135/2423794478_492d55f028.jpg

  6. How does it work? Red = Stop Yellow = go slow Green = Go http://dclips.fundraw.com/400dir/traffic_light_dan_gerhar_01.gif

  7. History of the traffic light • Invented by Garrett A. Morgan in 1922 • Patented in U.S. in1923 http://www.tfhrc.gov/pubrds/janpr/images/33.gif

  8. Fun Fact • Some argue that Morgan was NOT the first to invent the traffic light. • William Potts is one man who some think was the TRUE inventor of the traffic signal. http://images.google.co.th/images?gbv=2&hl=en&sa=1&q=Garrett+Morgan&aq=f&oq=&start=0

  9. What did Morgan’s first traffic signal look like? http://tti.tamu.edu/publications/researcher/v43n1/images/morgan_signal.jpg

  10. How has the traffic signal changed? • New types of signals • Electric • Uses sensors or timers to change lights http://www.inhabitat.com/wp-content/uploads/ledtrafficlight.jpg

  11. Why is the traffic signal important? • Saves lives! http://www.plu.edu/~safety/img/safety-first.jpg

  12. Why is the traffic signal important? • It helps traffic to run more smoothly. http://www.blogcdn.com/www.engadget.com/media/2008/07/7-23-08-traffic-light-yellow.jpg

  13. Thanks Garrett Morgan! • For your wonderful invention of the traffic signal! http://www.gorgeousgrout.com/sitebuildercontent/sitebuilderpictures/thankyou.jpg

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