NTPEP is the National Transportation Product Evaluation Program, a resource-pooling project for state Departments of Transportation run by my former employer AASHTO.
Here are four short paragraphs summarizing why I made this single page web application and how it works: README
This is the second version of the map. I added click functionality instead of hover, and a drop down menu by which users can select a transportation product type and then see those participating states turn white. Visit my GitHub account to see the complete code for this second version of the NTPEP map.
Please note that the implementation below uses Flexbox for styling.