1. Dialight. 12" ITE Compliant XL15 Long Life LED Traffic Signals Brochure. https://s3-us-west-2.amazonaws.com/catsy.557/Dialight_Traffic_LongLife_Aug2019.pdf.
2. FDOT. FDOT Approved Product List (APL): 650 – Vehicular Traffic Signal Assemblies. 2023. https://www.fdot.gov/traffic/traf-sys/product-specifications.shtm.
3. How Batteries store and release energy: Explaining basic electrochemistry;Schmidt-Rohr K.;Journal of Chemical Education,2018
4. First one up the drive: A new sort of storage device gives lithium-ion batteries a run for their money. The Economist Science and Technology Edition The Economist.com July 12th 2014. https://www.economist.com/science-and-technology/2014/07/10/first-one-up-the-drive.
5. FuelCells.org Fuel Cell Basic Applications. 2023. http://www.fuelcells.org/basics/apps.html.