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memoto{Anna C. Kelley, CEO and the BACH Creative Board of Directors}

memofrom{Tanner N. Borskey, Project Developer}

memosubject{Definition Memo: Defining What Solar Powered Traffic Signs Are and What They Are Used For}

memodate{Thursday, January 10, 2019}

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The purpose of this memo is to define "Solar Powered Traffic Signs" so that BACH Creative will understand why solar powered traffic signs are needed, how solar powered traffic lights work, and the different types of solar powered traffic signs available.



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section*{Why Solar Powered Traffic Signs Are Needed?}

subsection*{Traditional Traffic Signs}

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Traffic signs can be seen at pedestrian crosswalks, railroad crossings, speed warnings, school zone warnings, etc. Standard traffic signs in urban areas have illumination from surrounding light sources such traffic lights, security lights on buildings, and vehicle headlights. Compared to urban areas, rural area traffic signs often only are illuminated by driver headlights which is not sufficient. Unfortunately these traffic signs are currently the most common style of traffic signs still seen today. They are dependent on surrounding area light sources for illumination, outdated, and often ignored which ultimately increases the dangers of the road.



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caption{Fatal Crashes by Traffic Control Devices [1]}

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subsection*{Solar Powered Traffic Signs}



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Solar powered traffic signs are the most up to date solution to increase traffic safety. These redesigned traffic signs prove to allow more visibility no matter of location or area. The number of fatal crashes just involving a STOP sign are the second leading result in fatal crashes in both 1999 and 2000 as seen in Figue 1. The inability to see a STOP sign due to lack of illumination are one of the leading reasons why these fatal crashes occur. Solar powered traffic signs would help eliminate a great percentage of fatalities by providing drivers with a bright, continuous flashing signal on the sign resulting in the sign becoming appearance becoming more visible to all drivers on the road. Inventor, David Hubbell states, "There is, therefore, a need to have an illuminated traffic sign that is visible to a driver before the vehicle's headlights hit it without depending on ambient lighting sources for illumination." cite{bierman2006self}



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section*{How Do Solar Powered Traffic Signs Work?}



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