rydens/appalcart-sign ? reverse-engineered prompt

Build me a simple AppalCart sign app that runs on a screen and shows live bus info in a clean, easy to read way.

It should pull the AppalCart JSON data for vehicles, stops, and service announcements, then figure out which buses are coming, what route they are on, and how long until they arrive. I want the routes labeled with their names and colors, like Blue, Gold, Red, Orange, Green, and the rest from the route list in the README. If there are service alerts, show those too in a clear banner or separate area.

Make the display feel like a transit sign, with big text and a layout that works from across the room. If it helps, look up current docs online for the API details and any C or C++ JSON parsing approach you need. Please wire it up so the main screen updates automatically and is ready to run on a small kiosk or monitor.