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In page Speed limit:

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Minimum speed limits are often expressed with signs using blue circles, based on the obligatory sign specifications of the Vienna Convention on Road Signs and Signals. In the United States, minimum speed limit signs are identical to their respective maximum speed limit signs, with SPEED LIMIT replaced with MINIMUM SPEED.[citation needed] Some South American countries (e.g.: Argentina) use a red border.[citation needed] Japan[1] and South Korea[citation needed] use their normal speed limit sign, with a line below the limit.