Certifying and proving such a system was actually fool proof would be quite costly though, as in house certification would probably not satisfy safety regulations.
Side note: most lights use inductive loops not weight sensors for vehicle detection.
Oh I agree. Building a prototype and proof of concept alone would go along way to getting more on board.
I think the biggest challenge though is getting municipalities to replace current systems. They have already invested millions and millions to get the current traffic system up.
It would almost have to be the next cycle of traffic lights, when the old ones get replaced (depreciate fully).
And of course, cities would probably want to do their own independent testing/study...
It would be sweet to start seeing them appear on new construction though.
Side note: most lights use inductive loops not weight sensors for vehicle detection.