‘那辆’ is a demonstrative phrase meaning ‘that (vehicle)’. It combines the demonstrative pronoun ‘那’ (nà, ‘that’) with the measure word ‘辆’ (liàng), which is used exclusively for vehicles such as cars, buses, bicycles, and motorcycles. Unlike general demonstratives like ‘那个’ (nà ge, ‘that [thing]’), ‘那辆’ specifies a vehicle — it cannot be used for people, animals, or non-vehicle objects. The measure word ‘辆’ carries grammatical weight: omitting it (e.g., saying *‘那车’) is possible in informal speech but less precise and not standard in writing or formal contexts.

This phrase functions as a noun phrase on its own and often appears before a noun (e.g., ‘那辆车’) or stands alone when the vehicle is clear from context. It follows standard Chinese demonstrative syntax: demonstrative + measure word (+ noun). Tone and context determine whether ‘那’ refers to something physically distant or previously mentioned — not necessarily far away, but ‘not this one’ or ‘the one previously discussed’.