Good point OBG.
Recently a major intersection in my town was out. Flashing red, stop light. My 10 minute drive from 1 side of town to the other that takes 7 minutes took nearly 30.
If you had your gizmo it wouldn't matter because by the time you SEE the light it's <5minutes to get through.
The REAL problem is getting even near the light not going through it.
In reality if you are in town even a relatively small one (like mine) and a single goes out and it's a major hub single you are screwed. I could have walked or road a bike faster than we drove home.