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 Organizes traffic 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 http://www.carplus.org.uk/resp-car-use/rcu-images/traffic%20jam%20web.jpg

4. What does a traffic light do? Helps to prevent accidents 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. A traffic light is set up at an intersection. http://farm4.static.flickr.com/3135/2423794478_492d55f028.jpg

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

7. History of the traffic light Invented by Garrett A. Morgan in 1922 Invented by Garrett A. Morgan in 1922 Patented in U.S. in1923 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. 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. 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 New types of signals Electric Electric Uses sensors or timers to change lights 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! 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. 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! For your wonderful invention of the traffic signal! http://www.gorgeousgrout.com/sitebuildercontent/sitebuilderpictures/thankyou.jpg