巡逻车 (xún luó chē) literally means 'patrol vehicle' — combining 巡 (xún, 'to inspect or tour'), 逻 (luó, from the compound 巡逻 xúnluó meaning 'to patrol'), and 车 (chē, 'vehicle'). It refers specifically to a motor vehicle used by police, security personnel, or military forces to monitor an area, respond to incidents, or maintain public order. These vehicles are typically marked with official insignia, emergency lights, and sometimes sirens.

巡逻车 is commonly seen in urban streets, highways, airports, campuses, and large public venues. While often associated with police work, it may also be used by private security companies or border control units. Unlike generic terms like 警车 (jǐngchē, 'police car'), 巡逻车 emphasizes the *function* — active patrolling — rather than just institutional affiliation. It’s a formal, neutral term used in news reports, official documents, and everyday speech when describing mobile law enforcement presence.