The article explores how city layout and types of buildings affect traffic. Monocentric cities with one main area have high traffic but are good for public transit. Polycentric cities with multiple centers may not always have less traffic. Tokyo's organized traffic flow and Transit Oriented Development help manage traffic. Mixed land use can keep traffic within a community but may increase car travel outside. Evaluating land use's impact on traffic should consider a large area. The article suggests five ways to reduce congestion in China's cities.