‘公交车’ literally means ‘public transport vehicle’ — ‘公’ (gōng) means ‘public’ or ‘shared’, ‘交’ (jiāo) is short for ‘交通’ (jiāotōng, ‘transportation’), and ‘车’ (chē) means ‘vehicle’ or ‘car’. Together, the term specifically refers to a city bus: a large motor vehicle that carries many passengers along fixed routes, usually operated by municipal authorities or licensed companies. It’s the standard, neutral term used in daily conversation, signage, maps, and official announcements across China.

This word emphasizes the public-service nature of the vehicle — it’s not a private car or taxi, but a shared mode of urban transit accessible to all. You’ll hear it in contexts like commuting, giving directions, checking schedules, or reporting delays. While regional terms exist (e.g., ‘巴士’ bāshì, borrowed from ‘bus’), ‘公交车’ is universally understood and preferred in formal and informal Mandarin alike.