Vote to allow more dense, mixed-use, transit-oriented development as well as more and better public transit. In many cases there's a chicken-and-egg problem of NIMBYs blocking new, denser development because of fears of bringing too much traffic, but the public transit that would allay those fears isn't built because there's not enough density.

And so what happens is places get stuck in a trap of perpetual car-dependence, which is bad for the environment, bad for the economy, and bad for social equality (cars are super expensive and thus a particular burden on lower income folks, and many people with disabilities simply can't drive).

The only way to break the cycle is for people to recognize what's happening and intentionally vote their way out of it.