The Happiest Cities in the World are Also the Most Bicycle Friendly
"What do all these cities have in common? They put people before cars. Their governments invest in policies that benefit everyone not just motor vehicle commuters, they invest in climate-friendly infrastructure, and safe, active transportation infrastructure. And that investment pays off"
You could also turn it around, and say cars make people unhappy.
https://momentummag.com/the-happiest-cities-in-the-world-are-also-some-of-the-most-bicycle-friendly/