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If you are 20 or over, what is the legal alcohol limit in micrograms per litre of breath?
20歲或以上駕駛員的法定呼氣酒精上限為每升多少微克？
For drivers aged 20 or over, the legal breath-alcohol limit is 250 micrograms per litre.
20歲或以上駕駛員的呼氣酒精法定上限為每升250微克。
閱讀相關知識
Drivers under 20 have a zero limit. Drink counts cannot reliably establish legality, and even a small amount can impair driving.
年齡範圍包括剛滿20歲，未滿20歲為零酒精。不能以喝了幾杯推算一定合法，少量酒精也可能影響駕駛。