‘Sì tōng bā dá’ literally means ‘four thoroughfares and eight avenues’, evoking an ancient Chinese urban planning ideal where roads radiate in all cardinal and intercardinal directions—north, south, east, west, northeast, northwest, southeast, and southwest. Though the numbers four and eight are symbolic rather than literal, the phrase conveys a strong sense of comprehensive connectivity and easy access from every direction.

This idiom is used almost exclusively to describe physical infrastructure—especially transportation networks like road systems, subway lines, or city layouts—but can also extend metaphorically to digital platforms, logistics hubs, or even well-organized information systems. It carries a positive, modern, and efficient connotation, often appearing in official reports, urban planning documents, or promotional descriptions of cities and transport projects.