Reduce the need for shopping and entertainment commuting and build more transit so that more routs have practical non-car options and you reduce the need for traffic and parking, but that's realistically an incredibly expensive proposition for many cities. You need a really really really built out transit network to enable something close to point to point commuting in under an hour across a large city. (And traffic and parking becoming crippling things for a city are issues small cities often mostly duck by their nature of being small...)
It's a sort of "we all need to commit to changing our environment systematically for decades" problem.