If you ever see a car hit a light pole with a crosswalk sign, you can also ask the city if you can take it home; they have very similar stuff inside, including

If you ever see a car hit a light pole with a crosswalk sign, you can also ask the city if you can take it home; they have very similar stuff inside, including a double seven-digit display. It's not really "programmable", though - the only thing you can set is the duration of the walk/stop cycle, and how long the warning countdown lasts, and iirc it's powered by some pretty high voltages. But nothing is stopping you from connecting to the LEDs directly, via some pins that you can use a ribbon cable to connect to.