“Giving people more viable alternatives to driving means more people will choose not to drive, so there will be fewer cars on the road, reducing traffic for drivers.”
Concise, easy to understand, and accurate. I have used it at least a dozen times and it is remarkable how well it works.
Also—
“A bus is about twice as long as a car so it only needs to have four to six passengers on board to be more efficient than two cars.”
If you want I could drive from my Village. My local administration arranged a service where they have a car that drives you to bus stops to improve access to public transport, but I don’t want to book that, because you usually need to book it some time in advance.