Vehicular means "to do with vehicles" — cars, trucks, buses, motorbikes, anything that carries people or things along a road. It is the adjective form of the noun *vehicle*. You will almost never hear this word in normal talk. Nobody says "vehicular traffic was heavy today." They say "there were a lot of cars." Vehicular lives in official English: road signs, police reports, city rules, news about accidents, insurance papers. If you see it, someone is being formal on purpose. The places you actually meet it: - **vehicular traffic** — cars and trucks as a group, often used to separate them from people walking. A sign may say "No vehicular access" on a path where only people can go. - **vehicular accident / vehicular collision** — the police or news way of saying "car crash." - **vehicular homicide / vehicular manslaughter** — a legal charge in the US when a driver kills someone by driving badly or drunk. This is a courtroom term, not everyday speech. There is also a stretched use, mostly by writers and academics, where *vehicular* means "acting as a carrier for something else" — the same idea as when we say a language or a story is a *vehicle* for an idea. A *vehicular language* is one people from different mother tongues use to talk to each other. This use is rare and you can safely just recognise it, not produce it. One small thing: because it sounds heavy and official, using it in casual writing makes you sound stiff or slightly funny. Save it for signs, reports, and law.

車輛的、行車的（正式用語，多見於交通告示、警方或法律文件；vehicular homicide 台灣新聞常譯為「過失致死（駕駛）」）