Bibliography

I-STREETS            "Intelligent Traffic Management for the Future"

Photographs:
Fireman sweeping snow off of the traffic light: http://www.philly.com/philly/news

Clipart:
Microsoft Images: http://office.microsoft.com/en-us/images/
Google images: http://www.google.com/images

References
http://en.wikipedia.org/wiki/Traffic_light
http://auto.howstuffworks.com/car-driving-safety/safety-regulatory-devices/question234.htm
http://www.tech-faq.com/how-do-traffic-lights-work.html
http://www.tomar.com/pdf/catalogs/strobecom.pdf
http://www.census.gov/compendia/statab/cats/transportation/motor_vehicle_accidents_and_fatalities.html
http://www.edgarsnyder.com/car-accident/statistics.html
http://www33.brinkster.com/iiiii/trfclt/
http://www.ideafinder.com/history/inventions/trafficlight.htm
http://www.huffingtonpost.com/2010/01/02/led-traffic-lights-potent_n_409225.html
http://govpro.com/public_works/traffic_safety/snow-led-traffic-signals-20100202/
http://www.engadget.com/2009/12/17/led-traffic-lights-dont-melt-snow-do-cause-accidents/
http://articles.lancasteronline.com/local/4/345164
http://en.wikipedia.org/wiki/Chiral_Photonics
http://electronics.howstuffworks.com/gadgets/travel/gps.htm