The Traffic LightThe Traffic Light

Social Studies 9Social Studies 9

Ms. RebeccaMs. Rebecca

20092009

What is a traffic light?What is a traffic light?

http://en.wikipedia.org/wiki/Traffic_light

What does a traffic light do?What does a traffic light do?

Organizes trafficOrganizes 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

What does a traffic light do?What does a traffic light do?

Helps to prevent Helps to prevent accidentsaccidents

http://images.google.co.th/images?gbv=2&hl=en&sa=1&q=accident+at+intersection&aq=f&oq=&start=0http://www.freefoto.com/images/1216/05/1216_05_54---Stop-Sign--Beatty--Nevada--USA_web.jpg

How does it work?How does it work?

A traffic light is set A traffic light is set up at an up at an intersection.intersection.

http://farm4.static.flickr.com/3135/2423794478_492d55f028.jpg

How does it work?How does it work?

http://dclips.fundraw.com/400dir/traffic_light_dan_gerhar_01.gif

Red = Stop

Yellow = go slow

Green = Go

History of the traffic lightHistory of the traffic light

Invented by Garrett Invented by Garrett A. Morgan in 1922A. Morgan in 1922

Patented in U.S. Patented in U.S. in1923in1923

http://www.tfhrc.gov/pubrds/janpr/images/33.gif

Fun FactFun Fact

Some argue that Some argue that Morgan was NOT Morgan was NOT the first to invent the first to invent the traffic light.the traffic light.

William PottsWilliam Potts is one is one man who some man who some think was the TRUE think was the TRUE inventor of the inventor of the traffic signal.traffic signal.

http://images.google.co.th/images?gbv=2&hl=en&sa=1&q=Garrett+Morgan&aq=f&oq=&start=0

What did Morgan’s first traffic What did Morgan’s first traffic signal look like?signal look like?

http://tti.tamu.edu/publications/researcher/v43n1/images/morgan_signal.jpg

How has the traffic signal How has the traffic signal changed?changed?

New types of New types of signalssignals

ElectricElectric Uses sensors or Uses sensors or

timers to change timers to change lightslights

http://www.inhabitat.com/wp-content/uploads/ledtrafficlight.jpg

Why is the traffic signal Why is the traffic signal important?important?

Saves lives!Saves lives!

http://www.plu.edu/~safety/img/safety-first.jpg

Why is the traffic signal Why is the traffic signal important?important?

It helps traffic to It helps traffic to run more smoothly.run more smoothly.

http://www.blogcdn.com/www.engadget.com/media/2008/07/7-23-08-traffic-light-yellow.jpg

Thanks Garrett Morgan!Thanks Garrett Morgan!

For your wonderful For your wonderful invention of the invention of the traffic signal!traffic signal!

http://www.gorgeousgrout.com/sitebuildercontent/sitebuilderpictures/thankyou.jpg