Back when we (Zürich, Switzerland ) had a more car friendly city I recall the green waves that would trun lights green if you drove the speed limit. Back then 1980 and 1990s it was just timing and traffic detection rings under the pavement.

Nowadays public transport gets to go first and the "green wave" is optimized for bus lanes etc. (in the 80s to but not as extreme. ).

I don't recall having hitting a green wave in a long while because traffic is so bad during the day (this is by design to discourage driving through the city) something like that you only get to enjoy at night but by then many lights get set to orange anyway.