Almost 30 years ago I published https://web.archive.org/web/20071011162236/http://gaya.scienza.de/TACHO1.HTM (1995). It's about a #speedometer for cars which helps drivers to understand the kinetic energy associated with the speed of the car. Today, an improved version of such a speedometer is easy to implement.
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As for the color, red might indicate a higher risk (e.g. of dying in case of a collision) than green.
I ❤️ the Wayback Machine. I use it a lot for my Snark blog (https://snrk.de).